Rollback checkout version update

Author: dbalabka

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout source
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
 
       - name: Setup Conda Environment
         uses: conda-incubator/setup-miniconda@v2
@@ -36,15 +36,15 @@ jobs:
     name: "pre-commit hooks"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v2
       - uses: actions/setup-python@v5
       - uses: pre-commit/action@v3.0.1
 
   imports:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout source
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
 
       - name: Setup Conda Environment
         uses: conda-incubator/setup-miniconda@v2