[gh_actions]: Bump actions/checkout from 2.3.4 to 3.0.2 (flutter#5923)

Author: dependabot[bot]

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
         cd $GITHUB_WORKSPACE
     # Checks out a copy of the repo.
     - name: Check out code
-      uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
+      uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b
       with:
         fetch-depth: 0 # Fetch all history so the tool can get all the tags to determine version.
     - name: Set up tools

.github/workflows/scorecards-analysis.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846
+        uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b
         with:
           persist-credentials: false