tests

Fix load_launcher_manifest() not finding the manifest file #6780

Job	Run time
collateral (diffcov)	3m 56s
test_cygwin (39, windows-latest)	16m 44s
Fail the job if files changed under _disutils/_vendor folders	12s
collateral (docs)	2m 21s
test (>=3.13.5, windows-latest)	3m 30s
test (3.9, macos-latest)	3m 39s
test (3.9, windows-latest)	3m 28s
test (3.9, ubuntu-latest)	3m 34s
test (3.11, ubuntu-latest)	3m 19s
test (3.12, ubuntu-latest)	3m 34s
test (3.10, ubuntu-latest)	3m 35s
test (ubuntu-latest, 3.10, stdlib)	3m 27s
test (>=3.13.5, macos-latest)	3m 39s
test (pypy3.10, ubuntu-latest, stdlib)	3m 34s
test (>=3.13.5, ubuntu-latest)	3m 35s
test (3.14, ubuntu-latest)	3m 36s
integration-test	0s
check	5s
release	0s
	1h 5m 48s

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