npm: take 'version' directly from 'package.json'

We know the content of 'package.json' from earlier patches; there is
no need to parse the tarball name to extract the version.

(From OE-Core rev: f553e528e76f7e3925ed1c0950d96e73aec37da9)

Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/npm.bbclass

@@ -126,11 +126,6 @@ python npm_do_configure() {
         sha512 = bb.utils.sha512_file(tarball)
         return "sha512-" + base64.b64encode(bytes.fromhex(sha512)).decode()
 
-    def _npm_version(tarball):
-        """Return the version of a specified tarball"""
-        regex = r"-(\d+\.\d+\.\d+(-.*)?(\+.*)?)\.tgz"
-        return re.search(regex, tarball).group(1)
-
     def _npmsw_dependency_dict(orig, deptree):
         """
         Return the sub dictionary in the 'orig' dictionary corresponding to the
@@ -191,7 +186,7 @@ python npm_do_configure() {
             _npm_cache_add(tarball)
             # Add its signature to the cached shrinkwrap
             dep = _npmsw_dependency_dict(cached_shrinkwrap, deptree)
-            dep["version"] = _npm_version(tarball)
+            dep["version"] = pkg['version']
             dep["integrity"] = _npm_integrity(tarball)
             if params.get("dev", False):
                 dep["dev"] = True