Merge pull request #329 from step-security-bot/stepsecurity_remediation_1687629086

[StepSecurity] ci: Harden GitHub Actions

Author: garydgregory

.github/workflows/maven.yml

@@ -37,14 +37,14 @@ jobs:
     - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
       with:
         persist-credentials: false
-    - uses: actions/cache@v3.3.1
+    - uses: actions/cache@88522ab9f39a2ea568f7027eddc7d8d8bc9d59c8 # v3.3.1
       with:
         path: ~/.m2/repository
         key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
         restore-keys: |
           ${{ runner.os }}-maven-
     - name: Set up JDK ${{ matrix.java }}
-      uses: actions/setup-java@v3.11.0
+      uses: actions/setup-java@5ffc13f4174014e2d4d4572b3d74c3fa61aeb2c2 # v3.11.0
       with:
         distribution: 'temurin'
         java-version: ${{ matrix.java }}