[DevTools] Bump version for extensions (facebook#34723)

`./scripts/devtools/prepare-release.js` actually does automate the
version bump, but only path / minor ones.

Author: hoxyq

packages/react-devtools-extensions/chrome/manifest.json

@@ -2,8 +2,8 @@
   "manifest_version": 3,
   "name": "React Developer Tools",
   "description": "Adds React debugging tools to the Chrome Developer Tools.",
-  "version": "6.1.5",
-  "version_name": "6.1.5",
+  "version": "7.0.0",
+  "version_name": "7.0.0",
   "minimum_chrome_version": "114",
   "icons": {
     "16": "icons/16-production.png",

packages/react-devtools-extensions/edge/manifest.json

@@ -2,8 +2,8 @@
   "manifest_version": 3,
   "name": "React Developer Tools",
   "description": "Adds React debugging tools to the Microsoft Edge Developer Tools.",
-  "version": "6.1.5",
-  "version_name": "6.1.5",
+  "version": "7.0.0",
+  "version_name": "7.0.0",
   "minimum_chrome_version": "114",
   "icons": {
     "16": "icons/16-production.png",

packages/react-devtools-extensions/firefox/manifest.json

@@ -2,7 +2,7 @@
   "manifest_version": 3,
   "name": "React Developer Tools",
   "description": "Adds React debugging tools to the Firefox Developer Tools.",
-  "version": "6.1.5",
+  "version": "7.0.0",
   "browser_specific_settings": {
     "gecko": {
       "id": "@react-devtools",