2.72.2
(fix): Make each scheme’s credentials optional under any-composed auth. Previously,
with a multi-scheme auth: any: [...] config the generated client treated OAuth
(and other) credentials as unconditionally required at construction, so a caller
who only wanted API-key auth could not instantiate the client. Credentials now
fall back to environment variables without throwing, and the OAuth/inferred token
provider and auth headers are only set up when that scheme’s credentials are present.