packit: Move to nodejs-npm SRPM dependency

`npm` recently became broken in Fedora and doesn't provide the `npm`
binary any more. As a workaround, move to `nodejs-npm` to fix the srpm
build.

packit.yaml

@@ -8,7 +8,7 @@ copy_upstream_release_description: true
 
 srpm_build_deps:
   - make
-  - npm
+  - nodejs-npm
 
 actions:
   post-upstream-clone: