docs: update CONTRIBUTION.md for recommended Java versions (#4100)

GoogleContainerTools · Sep 8, 2023 · 54e5c0f · 54e5c0f
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -75,6 +75,10 @@ To run select integration tests, use `--tests=<testPattern>`, see [gradle docs](
 
 # Development Tips
 
+## Java version
+
+Use Java 8 or 11 for development. https://sdkman.io/ is a helpful tool to switch between Java versions.
+
 ## Configuring Eclipse
 
 Although jib is a mix of Gradle and Maven projects, we build everything using one