Pin GH plugin versions

.github/workflows/coverage.yml

diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index a31cc5a..f759529 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -29,11 +29,11 @@
         java: [ 8 ]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
       with:
         persist-credentials: false
     - name: Set up JDK ${{ matrix.java }}
-      uses: actions/setup-java@v3
+      uses: actions/setup-java@0ab4596768b603586c0de567f2430c30f5b0d2b0 # v3.13.0
       with:
         distribution: temurin
         java-version: ${{ matrix.java }}
@@ -42,6 +42,6 @@
       run: mvn -V test jacoco:report-aggregate --no-transfer-progress
 
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@eaaf4bedf32dbdc6b720b63067d99c4d77d6047d # v3.1.4
       with:
         files: ./docs-archive/target/site/jacoco-aggregate/jacoco.xml

.github/workflows/maven.yml

diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 15512d3..fc86ae4 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -29,11 +29,11 @@
         java: [ 8, 11, 17 ]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3
       with:
         persist-credentials: false
     - name: Set up JDK ${{ matrix.java }}
-      uses: actions/setup-java@v3
+      uses: actions/setup-java@0ab4596768b603586c0de567f2430c30f5b0d2b0 # v3
       with:
         distribution: temurin
         java-version: ${{ matrix.java }}