Bump actions/checkout from 2 to 2.3.4 (#90)

Author: dependabot[bot]

.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/setup-python@v2

.github/workflows/molecule.yml

@@ -24,7 +24,7 @@ jobs:
     steps:
       - name: Check out the codebase
         if: 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: github.event.pull_request.head.repo.full_name == github.repository