Bump jiro4989/setup-nim-action from 1 to 2 (#15)

Bumps [jiro4989/setup-nim-action](https://github.com/jiro4989/setup-nim-action) from 1 to 2.
- [Release notes](https://github.com/jiro4989/setup-nim-action/releases)
- [Commits](jiro4989/setup-nim-action@v1...v2)

---
updated-dependencies:
- dependency-name: jiro4989/setup-nim-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/docs.yml

@@ -29,7 +29,7 @@ jobs:
             ${{ runner.os }}-nimble-
 
       - name: Setup nim
-        uses: jiro4989/setup-nim-action@v1
+        uses: jiro4989/setup-nim-action@v2
         with:
           nim-version: devel