[TNT-7113] Use commit hashes for github repo actions

Author: dennisiterable

.github/workflows/build-matrix.yml

@@ -13,12 +13,12 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v1
+        uses: actions/checkout@50fbc622fc4ef5163becd7fab6573eac35f8462e
       - name: Mustache Specs
         run: |
           git submodule update --init --recursive
       - name: Set up JDK ${{ matrix.java_version }}
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@b6e674f4b717d7b0ae3baee0fbe79f498905dfde
         with:
           java-version: ${{ matrix.java_version }}
       - name: Install