workflows: Update major version of used actions

Those new versions use Node.js 20, so this gets rid of the warning about
Node.js 16 actions being deprecated.

.github/workflows/build.yml

@@ -12,8 +12,8 @@ jobs:
       contents: read
       packages: write
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-java@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
         with:
           java-version: '11'
           distribution: 'adopt'

.github/workflows/publish.yml

@@ -19,14 +19,14 @@ jobs:
       contents: read
       packages: write
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Import GPG Key
-        uses: crazy-max/ghaction-import-gpg@v5
+        uses: crazy-max/ghaction-import-gpg@v6
         with:
           gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
           passphrase: ${{ secrets.GPG_PASSPHRASE }}
       - name: Set up Java for publishing to Maven Central Repository
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: '11'
           distribution: 'adopt'