Bump @blockly/field-multilineinput from 5.0.17 to 6.0.3 in /src-editor

Bumps [@blockly/field-multilineinput](https://github.com/google/blockly-samples/tree/HEAD/plugins/field-multilineinput) from 5.0.17 to 6.0.3.
- [Release notes](https://github.com/google/blockly-samples/releases)
- [Changelog](https://github.com/RaspberryPiFoundation/blockly-samples/blob/master/plugins/field-multilineinput/CHANGELOG.md)
- [Commits](https://github.com/google/blockly-samples/commits/@blockly/field-multilineinput@6.0.3/plugins/field-multilineinput)

---
updated-dependencies:
- dependency-name: "@blockly/field-multilineinput"
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src-editor/package.json

@@ -5,7 +5,7 @@
     "type": "module",
     "dependencies": {
         "@blockly/field-colour": "^5.0.19",
-        "@blockly/field-multilineinput": "^5.0.17",
+        "@blockly/field-multilineinput": "^6.0.3",
         "@blockly/theme-dark": "^7.0.12",
         "@devbookhq/splitter": "^1.4.2",
         "@iobroker/adapter-react-v5": "^8.0.13",