ci: use Java 11 for samples testing (#505)

* ci: use Java 11 for samples testing

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* ci: Update pom.xml files for Java 11

* ci: Update pom.xml

* ci: Update image to Java 11

* ci: revert pom.xml changes

* ci: test adding GCF library

* ci: fix lint issue

* ci: updated samples pom.xml to use Java 11

* ci: Update owlbot.py

* ci: Remove temporary changes

* ci: Update owlbot to replace pom.xml params

* ci: remove unnecessary space

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* ci: revert createagent test

* ci: update owlbot.py

* ci: changed owlbot exclusion to substitution

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* ci: letting Owlbot change the samples.cfg files

* ci: update regex

* ci: update to owlbot.py

* ci: update to owlbot.py

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: 2 people

dialogflow-cx/snippets/pom.xml

@@ -18,8 +18,8 @@
   </parent>
 
   <properties>
-    <maven.compiler.target>1.8</maven.compiler.target>
-    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>11</maven.compiler.target>
+    <maven.compiler.source>11</maven.compiler.source>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   </properties>