workflows: test on both minimum and latest Java

It should be safe to generate the dist jar with the latest Java, but just
to be sure, continue using Java 22.

setup-java doesn't provide an alias for the latest Java release, so
specify it by version.

Signed-off-by: Benjamin Gilbert <bgilbert@cs.cmu.edu>

Author: bgilbert

.github/workflows/java.yaml

@@ -19,8 +19,10 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
+        java: [22, 23]
         include:
           - os: ubuntu-latest
+            java: 22
             dist: dist
     defaults:
       run:
@@ -32,7 +34,7 @@ jobs:
       uses: actions/setup-java@v4
       with:
         distribution: oracle
-        java-version: 22
+        java-version: ${{ matrix.java }}
         cache: maven
     - name: Install dependencies (Linux)
       if: matrix.os == 'ubuntu-latest'