Bump oven-sh/setup-bun from 1 to 2

Bumps [oven-sh/setup-bun](https://github.com/oven-sh/setup-bun) from 1 to 2.
- [Release notes](https://github.com/oven-sh/setup-bun/releases)
- [Commits](oven-sh/setup-bun@v1...v2)

---
updated-dependencies:
- dependency-name: oven-sh/setup-bun
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true
-      - uses: oven-sh/setup-bun@v1
+      - uses: oven-sh/setup-bun@v2
         with:
           bun-version: 1.1.8
       - run: bun install