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] <[email protected]>

Author: dependabot[bot]

.github/workflows/main-v3.yaml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install bun
-        uses: oven-sh/setup-bun@v1
+        uses: oven-sh/setup-bun@v2
         with:
           registry-url: https://npm.pkg.github.com
           scope: '@navikt'