Bump spring-boot-admin.version from 2.7.6 to 2.7.7 (#538)

Bumps `spring-boot-admin.version` from 2.7.6 to 2.7.7.

Updates `spring-boot-admin-starter-server` from 2.7.6 to 2.7.7
- [Release notes](https://github.com/codecentric/spring-boot-admin/releases)
- [Commits](codecentric/spring-boot-admin@2.7.6...2.7.7)

Updates `spring-boot-admin-server-ui` from 2.7.6 to 2.7.7
- [Release notes](https://github.com/codecentric/spring-boot-admin/releases)
- [Commits](codecentric/spring-boot-admin@2.7.6...2.7.7)

---
updated-dependencies:
- dependency-name: de.codecentric:spring-boot-admin-starter-server
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: de.codecentric:spring-boot-admin-server-ui
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

spring-petclinic-microservices/pom.xml

@@ -33,7 +33,7 @@
     <docker.image.dockerfile.dir>${basedir}</docker.image.dockerfile.dir>
     <docker.image.dockerize.version>v0.6.1</docker.image.dockerize.version>
     <docker.plugin.version>1.2.2</docker.plugin.version>
-    <spring-boot-admin.version>2.7.6</spring-boot-admin.version>
+    <spring-boot-admin.version>2.7.7</spring-boot-admin.version>
     <webjars-bootstrap.version>3.3.7-1</webjars-bootstrap.version>
     <webjars-jquery.version>3.1.1-1</webjars-jquery.version>
     <webjars-angular.version>1.6.4</webjars-angular.version>