fix(release): add Version.java as extra files in release-please (#12617)

Confirmed on dry run:

```
...
Fetching java-essential-contacts/google-cloud-essential-contacts/src/main/java/com/google/cloud/essentialcontacts/v1/stub/Version.java from branch renovate/add-version.java
❯ Fetching java-eventarc-publishing/google-cloud-eventarc-publishing/src/main/java/com/google/cloud/eventarc/publishing/v1/stub/Version.java from branch renovate/add-version.java
❯ Fetching java-eventarc/google-cloud-eventarc/src/main/java/com/google/cloud/eventarc/v1/stub/Version.java from branch renovate/add-version.java
❯ Fetching java-filestore/google-cloud-filestore/src/main/java/com/google/cloud/filestore/v1/stub/Version.java from branch renovate/add
...
```

Author: diegomarquezp

release-please-config.json

@@ -8,6 +8,16 @@
   "packages": {
     ".": {
       "extra-files": [
+        {
+					"type": "generic",
+					"path": "java-*/**/Version.java",
+					"glob": true
+				},
+        {
+					"type": "generic",
+					"path": "sdk-platform-java/java-showcase*/Version.java",
+					"glob": true
+				},
         ".github/workflows/generated_files_sync.yaml",
         ".github/workflows/hermetic_library_generation.yaml",
         "sdk-platform-java/WORKSPACE",