Upgrade checkout action.

Author: yossigo

.github/workflows/tags.yml

@@ -10,11 +10,11 @@ jobs:
     runs-on: ubuntu-20.04
     if: github.repository == 'redis/redis-snap'
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Determine version
       run: |
           echo "VERSION=${GITHUB_REF##*/}" >> $GITHUB_ENV
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         repository: redis/redis
         ref: ${{ env.VERSION }}

.github/workflows/unstable.yml

@@ -10,8 +10,8 @@ jobs:
     runs-on: ubuntu-20.04
     if: github.repository == 'redis/redis-snap'
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
+    - uses: actions/checkout@v3
       with:
         repository: redis/redis
         path: redis