ci: Roll NetBSD releases to 11.0, drop 9.4

[hebasto]

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[DrahtBot]

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[hebasto]

https://github.com/bitcoin-core/libmultiprocess/actions/runs/30274461317/job/90004862019?pr=321:

Test project /home/runner/work/libmultiprocess/libmultiprocess/build-netbsd
    Start 1: mptest
1/1 Test #1: mptest ...........................***Failed    0.18 sec
[ TEST ] listen_tests.cpp:214: ListenConnections accepts incoming connections
[ PASS ] listen_tests.cpp:214: ListenConnections accepts incoming connections (5338 μs)
[ TEST ] listen_tests.cpp:224: ListenConnections enforces a local connection limit
[ PASS ] listen_tests.cpp:224: ListenConnections enforces a local connection limit (5166 μs)
[ TEST ] listen_tests.cpp:262: ListenConnections accepts multiple connections
[ PASS ] listen_tests.cpp:262: ListenConnections accepts multiple connections (4218 μs)
[ TEST ] spawn_tests.cpp:50: SpawnProcess does not run callback in child
[ PASS ] spawn_tests.cpp:50: SpawnProcess does not run callback in child (66370 μs)
[ TEST ] test.cpp:143: Call FooInterface methods
[ PASS ] test.cpp:143: Call FooInterface methods (36477 μs)
[ TEST ] test.cpp:274: Call IPC method after client connection is closed
[ PASS ] test.cpp:274: Call IPC method after client connection is closed (1379 μs)
[ TEST ] test.cpp:284: Calling IPC method after server connection is closed
[ PASS ] test.cpp:284: Calling IPC method after server connection is closed (1220 μs)
[ TEST ] test.cpp:294: Calling IPC method and disconnecting during the call
[ PASS ] test.cpp:294: Calling IPC method and disconnecting during the call (1323 μs)
[ TEST ] test.cpp:307: Calling IPC method, disconnecting and blocking during the call
[ PASS ] test.cpp:307: Calling IPC method, disconnecting and blocking during the call (3011 μs)
[ TEST ] test.cpp:349: Worker thread destroyed before it is initialized
[ PASS ] test.cpp:349: Worker thread destroyed before it is initialized (16281 μs)
[ TEST ] test.cpp:379: Calling async IPC method, with server disconnect racing the call
[ PASS ] test.cpp:379: Calling async IPC method, with server disconnect racing the call (20428 μs)
[ TEST ] test.cpp:404: Calling async IPC method, with server disconnect after cleanup
[ PASS ] test.cpp:404: Calling async IPC method, with server disconnect after cleanup (2712 μs)
[ TEST ] test.cpp:428: Destroying ProxyClient<> with destroy method after peer disconnect
terminate called after throwing an instance of 'std::runtime_error'
  what():  IPC client method called after disconnect.
*** Received signal #6: Abort trap
stack: 
0% tests passed, 1 tests failed out of 1
Total Test time (real) =   0.18 sec
The following tests FAILED:
	  1 - mptest (Failed)
Errors while running CTest

Related (?): bitcoin/bitcoin#35823