ci: Change back to actions/setup-java with gpg key removal fix

v2 has been updated to include
actions/setup-java#226 in the
https://github.com/actions/setup-java/commits/v2.3.1 release.

Signed-off-by: BJ Hargrave <hargrave@us.ibm.com>

.github/workflows/cibuild.yml

@@ -59,7 +59,7 @@ jobs:
     - name: Git Checkout
       uses: actions/checkout@v2
     - name: Set up Java ${{ matrix.java }}
-      uses: bjhargrave/setup-java@only-subkey-signing # actions/setup-java@v2
+      uses: actions/setup-java@v2
       with:
         distribution: 'temurin'
         java-version: ${{ matrix.java }}