chore(deps): update all dependencies to v4 (#606)

* chore(deps): update all dependencies to v4

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* revert

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Anthonios Partheniou <[email protected]>

Author: 3 people

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

@@ -10,7 +10,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v3
     - name: Setup Python
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
         python-version: "3.8"
     - name: Install nox

packages/google-cloud-firestore/.github/workflows/system_emulated.yml

@@ -15,7 +15,7 @@ jobs:
       uses: actions/checkout@v3
 
     - name: Setup Python
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
         python-version: '3.7'