chore: bump codemirror from 5.65.16 to 6.0.2

---
updated-dependencies:
- dependency-name: codemirror
  dependency-version: 6.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/markdown/package.json

@@ -40,7 +40,7 @@
     "@contentful/f36-tokens": "^4.0.5",
     "@contentful/field-editor-shared": "^2.9.0",
     "@types/codemirror": "0.0.109",
-    "codemirror": "^5.65.11",
+    "codemirror": "^6.0.2",
     "constate": "^3.3.2",
     "emotion": "^10.0.17",
     "lodash": "^4.17.15",