deps: update project.opencensus.version to v0.31.0 (#1563)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [io.opencensus:opencensus-testing](https://togithub.com/census-instrumentation/opencensus-java) | `0.30.0` -> `0.31.0` | [![age](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-testing/0.31.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-testing/0.31.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-testing/0.31.0/compatibility-slim/0.30.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-testing/0.31.0/confidence-slim/0.30.0)](https://docs.renovatebot.com/merge-confidence/) |
| [io.opencensus:opencensus-impl](https://togithub.com/census-instrumentation/opencensus-java) | `0.30.0` -> `0.31.0` | [![age](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-impl/0.31.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-impl/0.31.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-impl/0.31.0/compatibility-slim/0.30.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-impl/0.31.0/confidence-slim/0.30.0)](https://docs.renovatebot.com/merge-confidence/) |
| [io.opencensus:opencensus-contrib-http-util](https://togithub.com/census-instrumentation/opencensus-java) | `0.30.0` -> `0.31.0` | [![age](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-contrib-http-util/0.31.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-contrib-http-util/0.31.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-contrib-http-util/0.31.0/compatibility-slim/0.30.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-contrib-http-util/0.31.0/confidence-slim/0.30.0)](https://docs.renovatebot.com/merge-confidence/) |
| [io.opencensus:opencensus-api](https://togithub.com/census-instrumentation/opencensus-java) | `0.30.0` -> `0.31.0` | [![age](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-api/0.31.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-api/0.31.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-api/0.31.0/compatibility-slim/0.30.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-api/0.31.0/confidence-slim/0.30.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>census-instrumentation/opencensus-java</summary>

### [`v0.31.0`](https://togithub.com/census-instrumentation/opencensus-java/releases/v0.31.0)

[Compare Source](https://togithub.com/census-instrumentation/opencensus-java/compare/v0.30.0...v0.31.0)

-   fix: Shutdown Stackdriver MetricServiceClient properly by [@&#8203;janhicken](https://togithub.com/janhicken) in [census-instrumentation/opencensus-java#2091
-   implement gRPC client retry stats measures and views by [@&#8203;mackenziestarr](https://togithub.com/mackenziestarr) in [census-instrumentation/opencensus-java#2084

**Full Changelog**: census-instrumentation/opencensus-java@v0.29.0...v0.31.0

</details>

---

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pom.xml

@@ -571,7 +571,7 @@
     <project.xpp3.version>1.1.4c</project.xpp3.version>
     <project.httpclient.version>4.5.13</project.httpclient.version>
     <project.httpcore.version>4.4.15</project.httpcore.version>
-    <project.opencensus.version>0.30.0</project.opencensus.version>
+    <project.opencensus.version>0.31.0</project.opencensus.version>
     <project.root-directory>..</project.root-directory>
     <deploy.autorelease>false</deploy.autorelease>
   </properties>