Bump blockly from 11.2.2 to 12.5.1 in /src-editor

Bumps [blockly](https://github.com/RaspberryPiFoundation/blockly) from 11.2.2 to 12.5.1.
- [Release notes](https://github.com/RaspberryPiFoundation/blockly/releases)
- [Commits](RaspberryPiFoundation/blockly@blockly-v11.2.2...blockly-v12.5.1)

---
updated-dependencies:
- dependency-name: blockly
  dependency-version: 12.5.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src-editor/package-lock.json

@@ -23,7 +23,7 @@
         "@types/react-dom": "^18.3.7",
         "@types/reactour": "^1.18.5",
         "@vitejs/plugin-react": "^5.2.0",
-        "blockly": "^11.2.2",
+        "blockly": "^12.5.1",
         "file-selector": "^2.1.2",
         "jszip": "^3.10.1",
         "monaco-editor": "~0.55.1",