Bump schema version (#15036)

* Bump schema version

This should have been included in
f10caa73ee (and #14979).

* Changelog

changelog.d/15036.misc

@@ -0,0 +1 @@
+Prepare for future database schema changes.

synapse/storage/schema/__init__.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-SCHEMA_VERSION = 73  # remember to update the list below when updating
+SCHEMA_VERSION = 74  # remember to update the list below when updating
 """Represents the expectations made by the codebase about the database schema
 
 This should be incremented whenever the codebase changes its requirements on the
@@ -78,7 +78,7 @@ Changes in SCHEMA_VERSION = 72:
     - Unused column application_services_state.last_txn is dropped
     - Cache invalidation stream id sequence now begins at 2 to match code expectation.
 
-Changes in SCHEMA_VERSION = 73;
+Changes in SCHEMA_VERSION = 73:
     - thread_id column is added to event_push_actions, event_push_actions_staging
       event_push_summary, receipts_linearized, and receipts_graph.
     - Add table `event_failed_pull_attempts` to keep track when we fail to pull
@@ -86,6 +86,11 @@ Changes in SCHEMA_VERSION = 73;
     - Add indexes to various tables (`event_failed_pull_attempts`, `insertion_events`,
       `batch_events`) to make it easy to delete all associated rows when purging a room.
     - `inserted_ts` column is added to `event_push_actions_staging` table.
+
+Changes in SCHEMA_VERSION = 74:
+    - A query on `event_stream_ordering` column has now been disambiguated (i.e. the
+      codebase can handle the `current_state_events`, `local_current_memberships` and
+      `room_memberships` tables having an `event_stream_ordering` column).
 """