Convert pkg_resources usage to importlib

Importlib is the modern replacement for pkg_resources and is bundled in
python itself. Meanwhile pkg_resources is part of setuptools which is no
longer included in python as of python3.12. Do this transition to be
ready for python3.12 but also to modernize our package introspection.

Change-Id: I9a404e34ae2a833a925dcc156073e0f3f0680a11

zuul/driver/github/graphql/__init__.py

@@ -11,9 +11,9 @@
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations
 # under the License.
-import logging
 
-from pkg_resources import resource_string
+import importlib.resources
+import logging
 
 from zuul.lib.logutil import get_annotated_logger
 
@@ -40,8 +40,9 @@ class GraphQLClient:
             'canmerge-legacy',
         ]
         for query_name in query_names:
-            self.queries[query_name] = resource_string(
-                __name__, '%s.graphql' % query_name).decode('utf-8')
+            f = importlib.resources.files('zuul').joinpath(
+                'driver/github/graphql/%s.graphql' % query_name)
+            self.queries[query_name] = f.read_bytes().decode()
 
     @staticmethod
     def _prepare_query(query, variables):

zuul/version.py

@@ -18,15 +18,14 @@
 import json
 
 from importlib import metadata as importlib_metadata
-import pkg_resources
 
-release_string = importlib_metadata.distribution('zuul').version
+zuul_distribution = importlib_metadata.distribution('zuul')
+release_string = zuul_distribution.version
 
 is_release = None
 git_version = None
 try:
-    _metadata = json.loads(
-        pkg_resources.get_distribution('zuul').get_metadata('pbr.json'))
+    _metadata = json.loads(zuul_distribution.read_text('pbr.json'))
     if _metadata:
         is_release = _metadata['is_release']
         git_version = _metadata['git_version']