build(deps): bump scratch-paint from 28d8e20 to 87cbb3b (#540)

Bumps [scratch-paint](https://github.com/TurboWarp/scratch-paint) from `28d8e20` to `87cbb3b`.
- [Release notes](https://github.com/TurboWarp/scratch-paint/releases)
- [Commits](https://github.com/TurboWarp/scratch-paint/compare/28d8e2009a82d006ef857437ea4f67c7d631bc0c...87cbb3b285ad5581c957795f7e606d13887bcab9)

---
updated-dependencies:
- dependency-name: scratch-paint
  dependency-type: direct:production
...

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

package-lock.json

@@ -15680,8 +15680,8 @@
       }
     },
     "scratch-paint": {
-      "version": "git+https://github.com/TurboWarp/scratch-paint.git#28d8e2009a82d006ef857437ea4f67c7d631bc0c",
-      "from": "git+https://github.com/TurboWarp/scratch-paint.git#develop",
+      "version": "git+https://github.com/TurboWarp/scratch-paint.git#87cbb3b285ad5581c957795f7e606d13887bcab9",
+      "from": "git+https://github.com/TurboWarp/scratch-paint.git#87cbb3b285ad5581c957795f7e606d13887bcab9",
       "requires": {
         "@scratch/paper": "0.11.20200728195508",
         "classnames": "2.2.5",