fix(auth): strip trailing slashes from OAuth metadata URLs #3531

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	1m 0s
checks / docs	1m 2s
checks / test (3.10, locked, windows-latest)	1m 59s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 27s
checks / test (3.11, lowest-direct, windows-latest)	1m 58s
checks / test (3.10, locked, ubuntu-latest)	1m 35s
checks / test (3.11, locked, windows-latest)	1m 50s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.13, locked, windows-latest)	1m 56s
checks / test (3.11, locked, ubuntu-latest)	1m 9s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 29s
checks / test (3.12, locked, ubuntu-latest)	1m 45s
checks / test (3.12, locked, windows-latest)	1m 29s
checks / test (3.12, lowest-direct, windows-latest)	1m 54s
checks / test (3.10, lowest-direct, windows-latest)	1m 49s
checks / test (3.14, lowest-direct, windows-latest)	1m 57s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 22s
checks / test (3.14, locked, ubuntu-latest)	1m 17s
checks / test (3.13, lowest-direct, windows-latest)	1m 33s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.14, locked, windows-latest)	2m 32s
checks / test (3.13, locked, ubuntu-latest)	1m 7s
all-green	2s
	34m 53s

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