build(deps): bump junixsocket.version in /samples/java/cloud-run

Bumps `junixsocket.version` from 2.7.2 to 2.8.1.

Updates `com.kohlschutter.junixsocket:junixsocket-core` from 2.7.2 to 2.8.1
- [Release notes](https://github.com/kohlschutter/junixsocket/releases)
- [Commits](kohlschutter/junixsocket@junixsocket-2.7.2...junixsocket-2.8.1)

Updates `com.kohlschutter.junixsocket:junixsocket-common` from 2.7.2 to 2.8.1
- [Release notes](https://github.com/kohlschutter/junixsocket/releases)
- [Commits](kohlschutter/junixsocket@junixsocket-2.7.2...junixsocket-2.8.1)

---
updated-dependencies:
- dependency-name: com.kohlschutter.junixsocket:junixsocket-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: com.kohlschutter.junixsocket:junixsocket-common
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

samples/java/cloud-run/pom.xml

@@ -18,7 +18,7 @@
     <maven.compiler.source>17</maven.compiler.source>
     <maven.compiler.target>17</maven.compiler.target>
     <java.version>17</java.version>
-    <junixsocket.version>2.7.2</junixsocket.version>
+    <junixsocket.version>2.8.1</junixsocket.version>
   </properties>
 
   <modelVersion>4.0.0</modelVersion>