build(deps): bump deepmerge-ts and shepherd.js (#3000)

Bumps [deepmerge-ts](https://github.com/RebeccaStevens/deepmerge-ts) to 8.0.2 and updates ancestor dependency [shepherd.js](https://github.com/shipshapecode/shepherd). These dependencies need to be updated together.


Updates `deepmerge-ts` from 7.1.5 to 8.0.2
- [Release notes](https://github.com/RebeccaStevens/deepmerge-ts/releases)
- [Changelog](https://github.com/RebeccaStevens/deepmerge-ts/blob/main/CHANGELOG.md)
- [Commits](RebeccaStevens/deepmerge-ts@v7.1.5...v8.0.2)

Updates `shepherd.js` from 15.0.0 to 15.3.0
- [Release notes](https://github.com/shipshapecode/shepherd/releases)
- [Changelog](https://github.com/shipshapecode/shepherd/blob/main/CHANGELOG.md)
- [Commits](https://github.com/shipshapecode/shepherd/commits)

---
updated-dependencies:
- dependency-name: deepmerge-ts
  dependency-version: 8.0.2
  dependency-type: indirect
- dependency-name: shepherd.js
  dependency-version: 15.3.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package-lock.json

@@ -26,7 +26,7 @@
     "@angular/platform-browser-dynamic": "^21.0.0",
     "core-js": "^3.39.0",
     "rxjs": "^7.8.1",
-    "shepherd.js": "^15.0.0",
+    "shepherd.js": "^15.3.0",
     "tslib": "^2.8.0",
     "zone.js": "~0.16.0"
   },

package.json

@@ -20,7 +20,7 @@
     "url": "https://github.com/RobbieTheWagner"
   },
   "dependencies": {
-    "shepherd.js": "^15.0.0"
+    "shepherd.js": "^15.3.0"
   },
   "peerDependencies": {
     "@angular/common": "^21.0.0",