Build(deps): Bump source-map in /app/assets/javascripts (#19090)

Bumps [source-map](https://github.com/mozilla/source-map) from 0.6.1 to 0.7.4.
- [Release notes](https://github.com/mozilla/source-map/releases)
- [Changelog](https://github.com/mozilla/source-map/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mozilla/source-map/compare/0.6.1...v0.7.4)

---
updated-dependencies:
- dependency-name: source-map
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

app/assets/javascripts/discourse/package.json

@@ -89,7 +89,7 @@
     "sass": "^1.56.1",
     "select-kit": "1.0.0",
     "sinon": "^14.0.2",
-    "source-map": "^0.6.1",
+    "source-map": "^0.7.4",
     "terser": "5.10.0",
     "tippy.js": "^6.3.7",
     "virtual-dom": "^2.1.1",