Bump spin from 0.14 to 0.15 in the actions group

Bumps the actions group with 1 update: [spin](https://github.com/scientific-python/spin).


Updates `spin` from 0.14 to 0.15
- [Release notes](https://github.com/scientific-python/spin/releases)
- [Changelog](https://github.com/scientific-python/spin/blob/main/CHANGELOG.md)
- [Commits](scientific-python/spin@v0.14...v0.15)

---
updated-dependencies:
- dependency-name: spin
  dependency-version: '0.15'
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pyproject.toml

@@ -27,7 +27,7 @@ dependencies = [
 [project.optional-dependencies]
 test = ["pytest >= 8.0", "pytest-cov >= 5.0", "coverage[toml] >= 7.2"]
 lint = ["pre-commit == 4.3.0"]
-dev = ["changelist == 0.5", "spin == 0.14"]
+dev = ["changelist == 0.5", "spin == 0.15"]
 
 [project.urls]
 Home = "https://scientific-python.org/specs/spec-0001/"