fix(tests): use .invalid TLD for unresolvable DNS test #16607

Job	Run time
Linter	1m 1s
Generate llhttp sources	8s
Pre-Setup global build settings	3s
Benchmark	11m 53s
Cython coverage (ubuntu)	2m 9s
Autobahn testsuite (3.14, ubuntu)	11m 24s
Cython coverage (windows)	2m 57s
Test (3.11, ubuntu, false)	4m 20s
Test (3.10, ubuntu, false)	5m 3s
Test (3.10, Y, ubuntu, false)	6m 9s
Test (3.11, macos, false)	7m 42s
Test (3.13, windows, false)	5m 50s
Test (3.10, windows, false)	5m 12s
Test (3.13, macos, false)	5m 44s
Test (3.12, ubuntu, false)	4m 39s
Test (3.14, Y, ubuntu, false)	5m 49s
Test (3.14, ubuntu, false)	5m 17s
Test (3.12, Y, ubuntu, false)	5m 54s
Test (3.11, Y, ubuntu, false)	5m 29s
Test (pypy-3.11, Y, ubuntu, false)	7m 40s
Test (3.12, macos, false)	3m 43s
Test (ubuntu, 3.14t, false)	3m 54s
Test (3.12, windows, false)	2m 55s
Test (3.14, windows, false)	4m 33s
Test (3.13, Y, ubuntu, false)	5m 51s
Test (3.11, windows, false)	6m 20s
Test (3.13, ubuntu, false)	4m 41s
Test (3.14, macos, false)	3m 19s
Test (3.10, macos, false)	2m 53s
check	5s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }} ${{ matrix.musl }}	-1s
Pre-Deploy	-1s
Tarball	-1s
Deploy	-1s
	2h 22m 33s

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