Specify GitHub actions checkout release (#407)

Author: alessfg

.github/workflows/galaxy.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Check out the codebase
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Set up Python 3
         uses: actions/[email protected]

.github/workflows/molecule.yml

@@ -25,7 +25,7 @@ jobs:
     steps:
       - name: Check out the codebase
         if: "!(contains(matrix.scenario, 'plus') && github.event.pull_request.head.repo.full_name != github.repository)"
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Set up Python 3
         if: "!(contains(matrix.scenario, 'plus') && github.event.pull_request.head.repo.full_name != github.repository)"