build(deps): bump de.itemis.mps:extensions

Bumps de.itemis.mps:extensions from 2021.2.2874.a6090d8 to 9999.9.2963.7042edb-SNAPSHOT.

---
updated-dependencies:
- dependency-name: de.itemis.mps:extensions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

gradle/libs.versions.toml

@@ -5,7 +5,7 @@
 [versions]
 # MPS
 mpsBase = "2021.2.6"
-mpsExtensions = "2021.2.2874.a6090d8"
+mpsExtensions = "9999.9.2963.7042edb-SNAPSHOT"
 mpsGradlePlugin = "1.7.288.4ea765f"
 
 # modelix