build(deps-dev): bump scratch-blocks

Bumps [scratch-blocks](https://github.com/LLK/scratch-blocks) from 0.1.0-prerelease.20200630140237 to 0.1.0-prerelease.20200709183415.
- [Release notes](https://github.com/LLK/scratch-blocks/releases)
- [Commits](https://github.com/LLK/scratch-blocks/commits)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -108,7 +108,7 @@
     "redux-throttle": "0.1.1",
     "rimraf": "^2.6.1",
     "scratch-audio": "0.1.0-prerelease.20200528195344",
-    "scratch-blocks": "0.1.0-prerelease.20200630140237",
+    "scratch-blocks": "0.1.0-prerelease.20200709183415",
     "scratch-l10n": "3.10.20200708030815",
     "scratch-paint": "0.2.0-prerelease.20200627020736",
     "scratch-render": "0.1.0-prerelease.20200622210757",