Bump actions/checkout from 1 to 3

.github/workflows/create-release.yaml

@@ -12,7 +12,7 @@ jobs:
     outputs:
       upload_url: ${{ steps.create_release.outputs.upload_url }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Create release
         uses: actions/create-release@v1
         id: create_release
@@ -37,7 +37,7 @@ jobs:
             x86_64-unknown-linux-gnu,
           ]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
@@ -64,7 +64,7 @@ jobs:
     name: build_upload_docker
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Login to Github Container Registry
         uses: docker/login-action@v2
         with:

.github/workflows/docker-test.yml

@@ -5,6 +5,6 @@ jobs:
     name: Test Docker build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Test build of myceli docker
         run: docker build -f myceli.Dockerfile .

.github/workflows/linting.yaml

@@ -7,7 +7,7 @@ jobs:
     steps:
       - name: Install Protoc
         uses: arduino/setup-protoc@v1
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
         with:
           components: clippy

.github/workflows/unit-testing.yaml

@@ -7,7 +7,7 @@ jobs:
     steps:
       - name: Install Protoc
         uses: arduino/setup-protoc@v1
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable