Bump actions/checkout from 2 to 3

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2...v3)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/app-build.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Setup Java
         uses: actions/setup-java@v2
         with:

.github/workflows/app-lint.yaml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Setup Java
         uses: actions/setup-java@v2
         with:

.github/workflows/app-publish.yaml

@@ -11,7 +11,7 @@ jobs:
     if: ${{ github.repository == 'jellyfin/jellyfin-androidtv' }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Setup Java
         uses: actions/setup-java@v2
         with:

.github/workflows/app-test.yaml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Setup Java
         uses: actions/setup-java@v2
         with:

.github/workflows/gradlew-update.yaml

@@ -10,7 +10,7 @@ jobs:
     if: github.repository == 'jellyfin/jellyfin-androidtv'
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Update Gradle Wrapper
         uses: gradle-update/update-gradle-wrapper-action@v1
         with:

.github/workflows/gradlew-validate.yaml

@@ -13,6 +13,6 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Validate Gradle Wrapper
         uses: gradle/wrapper-validation-action@v1