feat(workflow): switch to bun for changelog generation

Updated the GitHub Actions workflow to use bun instead of deno for
changelog generation. This change includes replacing the setup-deno
action with the setup-bun action and updating the command to run
changelogithub using bunx.

BREAKING CHANGE: The workflow now requires bun instead of deno.

.github/workflows/release.yaml

@@ -35,9 +35,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: denoland/setup-deno@v1
-        with:
-          deno-version: ${{ env.DENO_VERSION }}
-      - run: deno run -A npm:changelogithub
+      - uses: oven-sh/setup-bun@v2
+      - run: bunx changelogithub
         env:
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}