fix(auth): forward user-agent to oauth flow requests #756

Job	Run time
checks / pre-commit	35s
checks / readme-snippets	13s
checks / test (3.10, lowest-direct, windows-latest)	2m 19s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, ubuntu-latest)	56s
checks / test (3.12, locked, windows-latest)	3m 41s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.13, locked, ubuntu-latest)	43s
checks / test (3.13, lowest-direct, ubuntu-latest)	58s
checks / test (3.11, locked, windows-latest)	2m 35s
checks / test (3.13, lowest-direct, windows-latest)	2m 35s
checks / test (3.10, locked, ubuntu-latest)	52s
checks / test (3.12, locked, ubuntu-latest)	55s
checks / test (3.11, lowest-direct, ubuntu-latest)	53s
checks / test (3.11, lowest-direct, windows-latest)	2m 35s
checks / test (3.10, locked, windows-latest)	2m 14s
checks / test (3.12, lowest-direct, windows-latest)	3m 29s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 20s
checks / test (3.13, locked, windows-latest)	2m 26s
checks / test (3.14, lowest-direct, windows-latest)	2m 22s
checks / test (3.14, locked, windows-latest)	3m 14s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
all-green	5s
	39m 7s

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