chore(deps): update dependency @rollup/plugin-babel to v6

This MR contains the following updates:

Package	Type	Update	Change
@rollup/plugin-babel (source)	devDependencies	major	^5.0.4 -> ^6.0.0

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Release Notes

rollup/plugins

v6.0.0

2022-10-08

Breaking Changes

• fix: prepare for Rollup 3 #​1303

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toolkit-showcase/package.json

@@ -12,7 +12,7 @@
         "@babel/preset-env": "^7.10.3",
         "@babel/runtime-corejs3": "^7.10.3",
         "@esm-bundle/chai": "^4.2.0",
-        "@rollup/plugin-babel": "^5.0.4",
+        "@rollup/plugin-babel": "^6.0.0",
         "@rollup/plugin-commonjs": "^23.0.0",
         "@rollup/plugin-json": "^4.1.0",
         "@rollup/plugin-node-resolve": "^14.0.0",