gha,ci: update checkout to v4

    outputs:

      num_code_changes: ${{ steps.get_code_changes.outputs.num_code_changes }}

    steps:

      - uses: actions/checkout@v3

      - uses: actions/checkout@v4

        with:

          fetch-depth: 0

      - name: Check for appropriately named topic branch

      image: ornladios/adios2:ci-formatting

    steps:

      - uses: actions/checkout@v3

      - uses: actions/checkout@v4

        with:

          path: gha

      - uses: actions/checkout@v3

      - uses: actions/checkout@v4

        with:

          ref: ${{ github.event.pull_request.head.sha }}

          path: source

            parallel: mpich

    steps:

      - uses: actions/checkout@v3

      - uses: actions/checkout@v4

        with:

          path: gha

      - uses: actions/checkout@v3

      - uses: actions/checkout@v4

        with:

          ref: ${{ github.event.pull_request.head.sha }}

          path: source

            compiler: xcode13_4_1

    steps:

      - uses: actions/checkout@v3

      - uses: actions/checkout@v4

        with:

          path: gha

      - uses: actions/checkout@v3

      - uses: actions/checkout@v4

        with:

          ref: ${{ github.event.pull_request.head.sha }}

          path: source

        shell: bash

    steps:

      - uses: actions/checkout@v3

      - uses: actions/checkout@v4

        with:

          path: gha

      - uses: actions/checkout@v3

      - uses: actions/checkout@v4

        with:

          ref: ${{ github.event.pull_request.head.sha }}

          path: source

        baseos: [ubuntu-bionic]

    steps:

      - uses: actions/checkout@v3

      - uses: actions/checkout@v4

        with:

          ref: ${{ github.event.pull_request.head.sha }}

          path: ci-source

        shell: bash -c "docker exec adios2-ci bash --login -e $(echo {0} | sed 's|/home/runner/work|/__w|g')"

    steps:

      - uses: actions/checkout@v3

      - uses: actions/checkout@v4

        with:

          repository: ${{ matrix.repo }}

          ref: ${{ matrix.ref }}