ci(release): update GitHub Actions to latest versions

- actions/checkout v4.2.2 -> v6.0.1
- actions/setup-java v4.7.1 -> v5.2.0
- googleapis/release-please-action v4.2.0 -> v4.4.0
- sigstore/cosign-installer v3.8.2 -> v4.0.0

Author: kidager

.github/workflows/release-please.yaml

@@ -20,7 +20,7 @@ jobs:
       release_created: ${{ steps.release.outputs.release_created }}
       tag_name: ${{ steps.release.outputs.tag_name }}
     steps:
-      - uses: googleapis/release-please-action@a02a34c4d625f9be7cb89156071d8567266a2445 # v4.2.0
+      - uses: googleapis/release-please-action@16a9c90856f42705d54a6fda1823352bdc62cf38 # v4.4.0
         id: release
         with:
           token: ${{ secrets.PAT_TOKEN }}
@@ -43,9 +43,9 @@ jobs:
           - keycloak-25.0.6
           - keycloak-24.0.5
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
 
-      - uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
+      - uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
         with:
           java-version: '21'
           distribution: 'temurin'
@@ -68,7 +68,7 @@ jobs:
             exit 1
           fi
 
-      - uses: sigstore/cosign-installer@3454372f43399081ed03b604cb2d021dabca52bb # v3.8.2
+      - uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad # v4.0.0
       - run: cosign version
 
       - name: Sign JARs with Cosign