Align Spotless googleJavaFormat version in pom.xml #28

Background

pom.xml pins the Spotless googleJavaFormat version to 1.17.0 (from the original scaffold). The workshop branches moved to 1.27.0, but main stayed on 1.17.0. Older google-java-format versions can format code differently from newer tooling (IDE plugins, other contributors), causing recurring Spotless check failures for contributors using newer formats.

Impact

• Contributors using IDE formatting based on newer google-java-format may see mvn spotless:check fail with no code change of their own.
• CI spotless:check and local formatting can disagree across versions, causing noise in PRs.

How to reproduce

1. Run mvn spotless:check on main — passes with 1.17.0.
2. Apply google-java-format 1.27+ to a file (e.g. via an IDE plugin).
3. Run mvn spotless:check again — may now fail on formatting differences for that file.

Where the fix should land

Bump the googleJavaFormat version in pom.xml to a current release (e.g. 1.27.0, matching the workshop branches), run mvn spotless:apply, and commit any resulting formatting changes in the same PR so the tree stays green.

Files touched

• pom.xml
• Any .java files re-formatted by mvn spotless:apply

Acceptance criteria

• pom.xml googleJavaFormat version is updated.
• mvn spotless:check passes on the whole codebase.
• CI code-quality job is green.