Merge branch 'od/ci-use-checkout-v3-when-applicable' into maint-2.38

Update GitHub CI to use actions/checkout@v3; use of the older
checkout@v2 gets annoying deprecation notices.

* od/ci-use-checkout-v3-when-applicable:
  ci(main): upgrade actions/checkout to v3

Author: gitster

.github/workflows/main.yml

@@ -83,7 +83,7 @@ jobs:
     if: needs.ci-config.outputs.enabled == 'yes'
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: git-for-windows/setup-git-for-windows-sdk@v1
     - name: build
       shell: bash
@@ -138,10 +138,10 @@ jobs:
       GIT_CONFIG_PARAMETERS: "'user.name=CI' 'user.email=ci@git'"
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: git-for-windows/setup-git-for-windows-sdk@v1
     - name: initialize vcpkg
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         repository: 'microsoft/vcpkg'
         path: 'compat/vcbuild/vcpkg'
@@ -258,7 +258,7 @@ jobs:
       runs_on_pool: ${{matrix.vector.pool}}
     runs-on: ${{matrix.vector.pool}}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - run: ci/install-dependencies.sh
     - run: ci/run-build-and-tests.sh
     - name: print test failures
@@ -291,7 +291,10 @@ jobs:
     runs-on: ubuntu-latest
     container: ${{matrix.vector.image}}
     steps:
+    - uses: actions/checkout@v3
+      if: matrix.vector.jobname != 'linux32'
     - uses: actions/checkout@v1
+      if: matrix.vector.jobname == 'linux32'
     - run: ci/install-docker-dependencies.sh
     - run: ci/run-build-and-tests.sh
     - name: print test failures
@@ -311,7 +314,7 @@ jobs:
       jobname: StaticAnalysis
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - run: ci/install-dependencies.sh
     - run: ci/run-static-analysis.sh
     - run: ci/check-directional-formatting.bash
@@ -331,7 +334,7 @@ jobs:
         artifact: sparse-20.04
     - name: Install the current `sparse` package
       run: sudo dpkg -i sparse-20.04/sparse_*.deb
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Install other dependencies
       run: ci/install-dependencies.sh
     - run: make sparse
@@ -343,6 +346,6 @@ jobs:
       jobname: Documentation
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - run: ci/install-dependencies.sh
     - run: ci/test-documentation.sh