ci: migrate changesets/action release workflow to v2

changesets/action v2 renamed the root action's inputs and outputs
(changesets/action#681) and now pushes release commits/tags via the GitHub
API, requiring the token through the `github-token` input rather than the
`GITHUB_TOKEN` env var (changesets/action#692). #133 bumped the action
1.9.0 -> 2.1.1 but left the release workflow on the v1 interface, so v2
would silently ignore the inputs, resolve the renamed output to empty, and
lose the token.

Inputs (renamed, alphabetized):
  version              -> version-script
  publish              -> publish-script
  createGithubReleases -> create-github-releases
  commit               -> commit-message
  title                -> pr-title
  prDraft              -> pr-draft

Outputs:
  publishedPackages    -> published-packages

Token: moved from `env: GITHUB_TOKEN` to the `github-token` input. Values
unchanged; verified against action.yml at the pinned v2.1.1 SHA.

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>

Author: zimeg

.github/workflows/release.yml

@@ -40,20 +40,19 @@ jobs:
         id: changesets
         uses: changesets/action@8488615a623b1b9c987934bb89eae8af6a946ac1 # v2.1.1
         with:
-          version: bash scripts/changeset_version.sh
-          publish: npx changeset publish
-          createGithubReleases: true
-          commit: "chore: release"
-          title: "chore: release"
-          prDraft: create
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: "chore: release"
+          create-github-releases: true
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          pr-draft: create
+          pr-title: "chore: release"
+          publish-script: npx changeset publish
+          version-script: bash scripts/changeset_version.sh
       - name: Get publication details
         id: release
         if: steps.changesets.outputs.published == 'true'
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          PUBLISHED_PACKAGES: ${{ steps.changesets.outputs.publishedPackages }}
+          PUBLISHED_PACKAGES: ${{ steps.changesets.outputs.published-packages }}
         run: |
           echo "url=$(gh release view --json url -q .url)" >> "$GITHUB_OUTPUT"
           echo "message=$(echo "$PUBLISHED_PACKAGES" | jq -r '.[] | "\(.name)@\(.version)"' | paste -sd ', ' -)" >> "$GITHUB_OUTPUT"