build: bump @swc/core from 1.15.18 to 1.15.21

Bumps [@swc/core](https://github.com/swc-project/swc/tree/HEAD/packages/core) from 1.15.18 to 1.15.21.
- [Release notes](https://github.com/swc-project/swc/releases)
- [Changelog](https://github.com/swc-project/swc/blob/main/CHANGELOG.md)
- [Commits](https://github.com/swc-project/swc/commits/v1.15.21/packages/core)

---
updated-dependencies:
- dependency-name: "@swc/core"
  dependency-version: 1.15.21
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -42,7 +42,7 @@
     "@stoplight/spectral-functions": "^1.10.1",
     "@stoplight/spectral-parsers": "^1.0.5",
     "@stoplight/spectral-ruleset-bundler": "^1.6.3",
-    "@swc/core": "^1.15.18",
+    "@swc/core": "^1.15.21",
     "@swc/jest": "^0.2.39",
     "@types/jest": "^30.0.0",
     "@types/lodash": "^4.17.24",