fix: strip trailing slashes from OAuth metadata URLs #289

Job	Run time
checks / pre-commit	37s
checks / readme-snippets	12s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.10, locked, windows-latest)	2m 25s
checks / test (3.12, lowest-direct, ubuntu-latest)	56s
checks / test (3.11, lowest-direct, windows-latest)	2m 37s
checks / test (3.11, locked, windows-latest)	2m 30s
checks / test (3.12, locked, windows-latest)	3m 29s
checks / test (3.14, lowest-direct, windows-latest)	3m 15s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.14, locked, ubuntu-latest)	2m 20s
checks / test (3.13, lowest-direct, windows-latest)	2m 39s
checks / test (3.12, locked, ubuntu-latest)	51s
checks / test (3.13, lowest-direct, ubuntu-latest)	46s
checks / test (3.10, lowest-direct, windows-latest)	2m 43s
checks / test (3.10, locked, ubuntu-latest)	45s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 20s
checks / test (3.13, locked, windows-latest)	2m 28s
checks / test (3.14, locked, windows-latest)	3m 10s
checks / test (3.13, locked, ubuntu-latest)	47s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.12, lowest-direct, windows-latest)	3m 53s
all-green	3s
	40m 4s

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