Update base GitHub actions version

Author: albertodvp

.github/workflows/haskell.yml

@@ -21,7 +21,7 @@ jobs:
         os: [ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: actions/cache@v2
         name: Cache librdkafka
@@ -67,7 +67,7 @@ jobs:
       tag: ${{ steps.tag.outputs.tag }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Check if cabal project is sane
         run: |
@@ -110,7 +110,7 @@ jobs:
       upload_url: ${{ steps.create_release.outputs.upload_url }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Create source distribution
         run: |