fix: [essentialcontacts] mark fields in Contacts message as REQUIRED (#…

…9572)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 542301348

Source-Link: https://togithub.com/googleapis/googleapis/commit/223fc66231e21123d6b5b39057e3bfded6b15bb4

Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/3683d2f2e58ecebe7f6214bcd53223531837fedb
Copy-Tag: eyJwIjoiamF2YS1lc3NlbnRpYWwtY29udGFjdHMvLk93bEJvdC55YW1sIiwiaCI6IjM2ODNkMmYyZTU4ZWNlYmU3ZjYyMTRiY2Q1MzIyMzUzMTgzN2ZlZGIifQ==

java-essential-contacts/README.md

@@ -20,7 +20,7 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file:
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>libraries-bom</artifactId>
-      <version>26.16.0</version>
+      <version>26.17.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>