Backport PR #42842: CI: Upgrade codecov-action to v2 (#42860)

Co-authored-by: Thomas Li <[email protected]>

Author: meeseeksmachine

.github/workflows/database.yml

@@ -99,7 +99,7 @@ jobs:
       run: python ci/print_skipped.py
 
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v2
       with:
         flags: unittests
         name: codecov-pandas

.github/workflows/posix.yml

@@ -92,7 +92,7 @@ jobs:
       run: python ci/print_skipped.py
 
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v2
       with:
         flags: unittests
         name: codecov-pandas

.github/workflows/python-dev.yml

@@ -74,7 +74,7 @@ jobs:
         coverage report -m
 
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v2
       with:
         flags: unittests
         name: codecov-pandas