Fix Synapse git info missing in version strings (#12973)

synapse/_scripts/update_synapse_database.py

@@ -19,7 +19,6 @@ import sys
 from typing import cast
 
 import yaml
-from matrix_common.versionstring import get_distribution_version_string
 
 from twisted.internet import defer, reactor as reactor_
 
@@ -28,6 +27,7 @@ from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.server import HomeServer
 from synapse.storage import DataStore
 from synapse.types import ISynapseReactor
+from synapse.util import SYNAPSE_VERSION
 
 # Cast safety: Twisted does some naughty magic which replaces the
 # twisted.internet.reactor module with a Reactor instance at runtime.
@@ -43,8 +43,7 @@ class MockHomeserver(HomeServer):
             hostname=config.server.server_name,
             config=config,
             reactor=reactor,
-            version_string="Synapse/"
-            + get_distribution_version_string("matrix-synapse"),
+            version_string=f"Synapse/{SYNAPSE_VERSION}",
         )