Auto merge of #101949 - matthiaskrgr:rollup-xu5cqnd, r=matthiaskrgr

Auto merge of #101949 - matthiaskrgr:rollup-xu5cqnd, r=matthiaskrgr

Rollup of 7 pull requests

Successful merges:

 - #101093 (Initial version of 1.64 release notes)
 - #101713 (change AccessLevels representation)
 - #101821 (Bump Unicode to version 15.0.0, regenerate tables)
 - #101826 (Enforce "joined()" and "joined_with_noop()" test)
 - #101835 (Allow using vendoring when running bootstrap from outside the source root)
 - #101942 (Revert "Copy stage0 binaries into stage0-sysroot")
 - #101943 (rustdoc: remove unused CSS `.non-exhaustive { margin-bottom }`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup