Use latest Storybook 7 RC

package.json

@@ -50,7 +50,7 @@
   },
   "dependencies": {
     "@emotion/weak-memoize": "^0.2.5",
-    "@storybook/theming": "^7.0.0-rc.1",
+    "@storybook/theming": "7.0.0-rc.7",
     "@types/pluralize": "^0.0.29",
     "@types/prismjs": "^1.16.6",
     "@types/react-modal": "^3.12.1",
@@ -75,15 +75,15 @@
     "@babel/preset-react": "^7.10.1",
     "@babel/preset-typescript": "^7.10.1",
     "@emotion/babel-plugin": "^11.9.2",
-    "@storybook/addon-a11y": "^7.0.0-rc.1",
-    "@storybook/addon-actions": "^7.0.0-rc.1",
-    "@storybook/addon-docs": "^7.0.0-rc.1",
-    "@storybook/addon-essentials": "^7.0.0-rc.1",
-    "@storybook/addon-storysource": "^7.0.0-rc.1",
+    "@storybook/addon-a11y": "7.0.0-rc.7",
+    "@storybook/addon-actions": "7.0.0-rc.7",
+    "@storybook/addon-docs": "7.0.0-rc.7",
+    "@storybook/addon-essentials": "7.0.0-rc.7",
+    "@storybook/addon-storysource": "7.0.0-rc.7",
     "@storybook/eslint-config-storybook": "^3.1.2",
     "@storybook/linter-config": "^3.1.2",
-    "@storybook/react": "^7.0.0-rc.1",
-    "@storybook/react-webpack5": "^7.0.0-rc.1",
+    "@storybook/react": "7.0.0-rc.7",
+    "@storybook/react-webpack5": "7.0.0-rc.7",
     "@svgr/cli": "^6.1.1",
     "@types/fs-extra": "^9.0.1",
     "auto": "^9.50.1",
@@ -103,7 +103,7 @@
     "react-dom": "17",
     "seedrandom": "^3.0.5",
     "sort-package-json": "^1.51.0",
-    "storybook": "^7.0.0-rc.1",
+    "storybook": "7.0.0-rc.7",
     "ts-loader": "^7.0.5",
     "typescript": "^4.9.5"
   },