Bump jiro4989/setup-nim-action from 1 to 2

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]>

.github/workflows/build.yml

@@ -21,6 +21,6 @@ jobs:
         path: ~/.nimble
         key: ${{ runner.os }}-nimble-stable
 
-    - uses: jiro4989/setup-nim-action@v1
+    - uses: jiro4989/setup-nim-action@v2
 
     - run: nimble test -y