Add optional subject field to AccessToken (fixes #1038) #2063

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	22s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.11, locked, ubuntu-latest)	53s
checks / test (3.10, lowest-direct, ubuntu-latest)	59s
checks / test (3.13, lowest-direct, ubuntu-latest)	56s
checks / test (3.12, locked, windows-latest)	3m 22s
checks / test (3.10, locked, ubuntu-latest)	52s
checks / test (3.12, lowest-direct, windows-latest)	3m 25s
checks / test (3.11, locked, windows-latest)	2m 43s
checks / test (3.10, locked, windows-latest)	1m 59s
checks / test (3.11, lowest-direct, windows-latest)	3m 9s
checks / test (3.11, lowest-direct, ubuntu-latest)	53s
checks / test (3.10, lowest-direct, windows-latest)	2m 59s
checks / test (3.14, locked, windows-latest)	3m 21s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.13, lowest-direct, windows-latest)	2m 37s
checks / test (3.12, locked, ubuntu-latest)	57s
checks / test (3.14, lowest-direct, windows-latest)	2m 29s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.14, locked, ubuntu-latest)	2m 23s
checks / test (3.13, locked, windows-latest)	2m 45s
all-green	3s
	40m 13s

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