Revert "Update dependency @types/react to v19"

Author: dsubak

ol-jupyter-authoring/package.json

@@ -68,7 +68,7 @@
         "@jupyterlab/testutils": "^4.0.0",
         "@types/jest": "^29.2.0",
         "@types/json-schema": "^7.0.11",
-        "@types/react": "^19.0.0",
+        "@types/react": "^18.0.26",
         "@types/react-addons-linked-state-mixin": "^0.14.22",
         "@typescript-eslint/eslint-plugin": "^6.1.0",
         "@typescript-eslint/parser": "^6.1.0",

ol-themed-jupyter/package.json

@@ -60,7 +60,7 @@
     "devDependencies": {
         "@jupyterlab/builder": "^4.0.0",
         "@types/json-schema": "^7.0.11",
-        "@types/react": "^19.0.0",
+        "@types/react": "^18.0.26",
         "@types/react-addons-linked-state-mixin": "^0.14.22",
         "@typescript-eslint/eslint-plugin": "^6.1.0",
         "@typescript-eslint/parser": "^6.1.0",

ol-themed-jupyter/yarn.lock

@@ -815,13 +815,6 @@
     "@types/prop-types" "*"
     csstype "^3.2.2"
 
-"@types/react@^19.0.0":
-  version "19.2.9"
-  resolved "https://registry.yarnpkg.com/@types/react/-/react-19.2.9.tgz#84ec7669742bb3e7e2e8d6a5258d95ead7764200"
-  integrity sha512-Lpo8kgb/igvMIPeNV2rsYKTgaORYdO1XGVZ4Qz3akwOj0ySGYMPlQWa8BaLn0G63D1aSaAQ5ldR06wCpChQCjA==
-  dependencies:
-    csstype "^3.2.2"
-
 "@types/semver@^7.5.0":
   version "7.7.1"
   resolved "https://registry.yarnpkg.com/@types/semver/-/semver-7.7.1.tgz#3ce3af1a5524ef327d2da9e4fd8b6d95c8d70528"