bump testbed pin npm

Signed-off-by: Jan Kowalleck <[email protected]>

Author: jkowalleck

tests/_testbeds/webpack5-vue2-cli-service/.npmrc

@@ -1,5 +1,7 @@
 ;  see the docs: https://docs.npmjs.com/cli/v9/using-npm/config
 
-engine-strict=false ; some node version might not be explicitly supported
 package-lock=true
 lockfile-version=3
+
+; some node version might not be explicitly supported
+engine-strict=false