ci: use a newer `github-script` version

The old version we currently use runs in node.js v12.x, which is being
deprecated in GitHub Actions. The new version uses node.js v16.x.

Incidentally, this also avoids the warning about the deprecated
`::set-output::` workflow command because the newer version of the
`github-script` Action uses the recommended new way to specify outputs.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Taylor Blau <me@ttaylorr.com>

.github/workflows/main.yml

@@ -37,14 +37,14 @@ jobs:
           echo "::set-output name=enabled::$enabled"
       - name: skip if the commit or tree was already tested
         id: skip-if-redundant
-        uses: actions/github-script@v3
+        uses: actions/github-script@v6
         if: steps.check-ref.outputs.enabled == 'yes'
         with:
           github-token: ${{secrets.GITHUB_TOKEN}}
           script: |
             try {
               // Figure out workflow ID, commit and tree
-              const { data: run } = await github.actions.getWorkflowRun({
+              const { data: run } = await github.rest.actions.getWorkflowRun({
                 owner: context.repo.owner,
                 repo: context.repo.repo,
                 run_id: context.runId,
@@ -54,7 +54,7 @@ jobs:
               const tree_id = run.head_commit.tree_id;
 
               // See whether there is a successful run for that commit or tree
-              const { data: runs } = await github.actions.listWorkflowRuns({
+              const { data: runs } = await github.rest.actions.listWorkflowRuns({
                 owner: context.repo.owner,
                 repo: context.repo.repo,
                 per_page: 500,