chore(deps): update all dependencies to v3 (#275)

* chore(deps): update all dependencies to v3

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packages/google-cloud-datastore/.github/workflows/mypy.yml

@@ -8,9 +8,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Setup Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v3
       with:
         python-version: "3.8"
     - name: Install nox