Update ci.yaml (#12)

switch to  actions/checkout@v3 from v2
switch to  actions/setup-python@v4 from v2
address another deprecation in GitHub Actions

Co-authored-by: Scott K Logan <logans@cottsay.net>

.github/workflows/ci.yaml

@@ -12,26 +12,26 @@ jobs:
  strategy: ${{steps.load.outputs.strategy}}
 
  steps:
- - uses: actions/checkout@v2
+ - uses: actions/checkout@v3
  - id: load
- run: echo "::set-output name=strategy::$(echo $(cat strategy.json))"
+ run: echo "strategy=$(echo $(cat strategy.json))" >> $GITHUB_OUTPUT
 
  canary:
  needs: [setup]
  strategy: ${{fromJson(needs.setup.outputs.strategy)}}
  runs-on: ${{matrix.os}}
 
  steps:
- - uses: actions/checkout@v2
+ - uses: actions/checkout@v3
  with:
  # Choose colcon-notification for a canary build. It has colcon
  # dependencies and debian patches, so exercieses a fair amount of the
  # CI action features.
  repository: colcon/colcon-notification
- - uses: actions/setup-python@v2
+ - uses: actions/setup-python@v4
  with:
  python-version: ${{matrix.python}}
- - uses: actions/checkout@v2
+ - uses: actions/checkout@v3
  with:
  path: colcon_ci
  - uses: ./colcon_ci/