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/build-and-test-linux.yaml

@@ -91,7 +91,7 @@ jobs:
             libc++-${{ matrix.compiler_version }}-dev \
             libc++abi-${{ matrix.compiler_version }}-dev
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Configure with CMake
         run: |
           set -x # show the commands we're running

.github/workflows/build-and-test-macos.yaml

@@ -25,7 +25,7 @@ jobs:
             libxinerama \
             lua
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Configure with CMake
         run: |
           set -x

.github/workflows/docker.yaml

@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
       - name: Set up Docker Buildx

.github/workflows/publish-appimage.yml

@@ -52,7 +52,7 @@ jobs:
             libxnvctrl-dev \
             ncurses-dev
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Import GPG Deploy Key
         run: |
           echo "${{ secrets.GPG_DEPLOY_KEY }}" > appimage/secret.gpg