Update to version 1.74.0.

Plus:
* so version bump in shlib package name.
* add fixes for more missed return values from non-void functions to
  return-values.patch
* minor rebase of terminate.patch for updated version.

grpc.changes

@@ -3,15 +3,15 @@ Sun Jul 27 08:00:17 UTC 2025 - Atri Bhattacharya <badshah400@gmail.com>
 
 - Update to version 1.74.0:
   * Core:
-  * [OTel C++, Posix EE] Plumb TCP write timestamps and metrics
+    - [OTel C++, Posix EE] Plumb TCP write timestamps and metrics
       to OTel tracers (gh#grpc/grpc#39946).
-  * [EventEngine] Fix Python reconnect issues: use iomgr backup
+    - [EventEngine] Fix Python reconnect issues: use iomgr backup
       poller when EE is disabled (gh#grpc/grpc#39894).
-  * [Python] Upgrade Pytype (Part - 1) (gh#grpc/grpc#39816).
-  * [Python] Upgrade black (gh#grpc/grpc#39774).
-  * [event_engine] Implement fork support in Posix Event Engine
+    - [Python] Upgrade Pytype (Part - 1) (gh#grpc/grpc#39816).
+    - [Python] Upgrade black (gh#grpc/grpc#39774).
+    - [event_engine] Implement fork support in Posix Event Engine
       (gh#grpc/grpc#38980).
-  * [http2] Fix GRPC_ARG_HTTP2_STREAM_LOOKAHEAD_BYTES for when
+    - [http2] Fix GRPC_ARG_HTTP2_STREAM_LOOKAHEAD_BYTES for when
       BDP is disabled (gh#grpc/grpc#39585).
 - Update return-values.patch with a couple more missed return
   values from non-void functions.