fix: suppress MCPServer KeyboardInterrupt tracebacks #2566

Job	Run time
checks / readme-snippets	15s
checks / pre-commit	37s
checks / test (3.10, locked, windows-latest)	1m 32s
checks / test (3.11, lowest-direct, windows-latest)	1m 12s
checks / test (3.10, locked, ubuntu-latest)	50s
checks / test (3.10, lowest-direct, ubuntu-latest)	43s
checks / test (3.11, lowest-direct, ubuntu-latest)	50s
checks / test (3.11, locked, windows-latest)	1m 20s
checks / test (3.14, lowest-direct, windows-latest)	2m 6s
checks / test (3.12, locked, ubuntu-latest)	49s
checks / test (3.13, lowest-direct, ubuntu-latest)	43s
checks / test (3.11, locked, ubuntu-latest)	42s
checks / test (3.14, lowest-direct, ubuntu-latest)	49s
checks / test (3.14, locked, windows-latest)	2m 3s
checks / test (3.10, lowest-direct, windows-latest)	1m 19s
checks / test (3.12, locked, windows-latest)	1m 12s
checks / test (3.13, locked, windows-latest)	1m 24s
checks / test (3.13, locked, ubuntu-latest)	44s
checks / test (3.13, lowest-direct, windows-latest)	1m 27s
checks / test (3.12, lowest-direct, windows-latest)	1m 19s
checks / test (3.14, locked, ubuntu-latest)	1m 45s
checks / test (3.12, lowest-direct, ubuntu-latest)	47s
all-green	3s
	24m 31s

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