tests

Restore test for pbr. Pin to newer version. #6774

Job	Run time
collateral (docs)	2m 26s
test (3.9, macos-latest)	3m 52s
collateral (diffcov)	4m 5s
test (3.9, ubuntu-latest)	3m 48s
test (>=3.13.5, ubuntu-latest)	3m 50s
test (3.14, ubuntu-latest)	3m 52s
test (3.10, ubuntu-latest)	3m 49s
test (pypy3.10, ubuntu-latest, stdlib)	3m 51s
test (3.9, windows-latest)	3m 46s
test (3.11, ubuntu-latest)	3m 44s
test_cygwin (39, windows-latest)	15m 54s
test (>=3.13.5, macos-latest)	3m 33s
test (3.12, ubuntu-latest)	3m 50s
test (ubuntu-latest, 3.10, stdlib)	3m 49s
test (>=3.13.5, windows-latest)	3m 45s
Fail the job if files changed under _disutils/_vendor folders	-1s
integration-test	0s
check	4s
release	0s
	1h 7m 57s

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