chore(v2): upgrade dependencies + require Node 12 (#4223)

* chore(v2): upgrade dependencies

* Set minimum Node.js version to 12.13

* Fix test

* Upgrade copy-text-to-clipboard

* Bump Node versions

* Update .nvmrc

* mark cacheTime as forbidded field

* Downgrade jest to v25.2.7

* Increase Node version for Windows CI

* Test fix

* Attempt to fix Windows CI

* Downgrade execa

* fix async test errors

* Upgrade execa

Co-authored-by: slorber <lorber.sebastien@gmail.com>

packages/docusaurus-migrate/src/index.ts

@@ -592,9 +592,9 @@ function migrateVersionedSidebar(
               acc: {[key: string]: Array<Record<string, unknown> | string>},
               val,
             ) => {
-              acc[val[0].replace(versionRegex, '')] = (val[1] as Array<
-                any
-              >).map((item) => {
+              acc[
+                val[0].replace(versionRegex, '')
+              ] = (val[1] as Array<any>).map((item) => {
                 if (typeof item === 'string') {
                   return item.replace(versionRegex, '');
                 }