Bump actions/checkout from 2.4.0 to 3

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.4.0 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.4.0...v3)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/api-integration-tests.yml

@@ -43,7 +43,7 @@ jobs:
             experimental: true
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v3
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2

.github/workflows/api-php-static-code-check.yml

@@ -13,7 +13,7 @@ jobs:
     name: "phpstan: Nextcloud ${{ matrix.nextcloud }}"
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v3
       - name: Set up php
         uses: shivammathur/setup-php@master
         with:

.github/workflows/api-php-tests.yml

@@ -15,7 +15,7 @@ jobs:
         experimental: [false]
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v3
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2

.github/workflows/build-release.yml

@@ -19,7 +19,7 @@ jobs:
         database: ['sqlite']
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v3
 
       - name: Setup PHP
         uses: shivammathur/setup-php@afefcaf556d98dc7896cca380e181decb609ca44

.github/workflows/documentation.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout master
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v3
 
       - name: Deploy docs
         uses: mhausenblas/mkdocs-deploy-gh-pages@master

.github/workflows/frontend-nodejs-tests.yml

@@ -15,7 +15,7 @@ jobs:
         experimental: [false]
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v3
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2

.github/workflows/post-merge-tasks.yml

@@ -13,7 +13,7 @@ jobs:
         nextcloud: ['stable23']
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v3
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2