Upgrade to npm lockfile v3 and explicitely set it (go-gitea#23561)

`npm@8` which comes with node 16 will by default write lockfile v2
`npm@9` which comes with recent versions of node 18 and above will write
lockfile v3

To avoid incorrect lockfile v2 generation on npm v8, force npm to write
lockfile v3, so no matter which npm version the user has installed, the
same lockfile format will be generated.

References:
-
https://docs.npmjs.com/cli/v9/configuring-npm/package-lock-json#lockfileversion
- https://nodejs.org/en/download/releases

Co-authored-by: delvh <[email protected]>

Author: silverwind

.npmrc

@@ -3,3 +3,4 @@ fund=false
 update-notifier=false
 package-lock=true
 save-exact=true
+lockfile-version=3