Update actions/checkout action to v3 (#2526)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v3.0.0
       with:
         submodules: recursive
 

.github/workflows/docker-ci.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v3.0.0
       with:
         submodules: recursive
 

.github/workflows/docker-publish-latest.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v3.0.0
       with:
         submodules: recursive
 

.github/workflows/docker-publish-main.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v3.0.0
       with:
         submodules: recursive
 

.github/workflows/docker-publish-released.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v3.0.0
       with:
         submodules: recursive
 

.github/workflows/publish.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v3.0.0
       with:
         submodules: recursive
 
@@ -402,7 +402,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v3.0.0
 
     # TODO: It'd be perfect if we could match final artifacts to the platform they target, so e.g. linux build comes from the linux machine
     # However, that is currently impossible due to https://github.com/dotnet/msbuild/issues/3897

.github/workflows/translations.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v3.0.0
       with:
         submodules: recursive
         token: ${{ secrets.ARCHIBOT_GITHUB_TOKEN }}