Auto merge of #137023 - Kobzol:bump-sccache, r=marcoieni

Bump sccache in CI to 0.9.1

We haven't updated the used sccache version for years, it has accrued a bunch of fixes and features in the meantime. It now supports the `--show-adv-stats` flag, which gives a more detailed summary of the results of caching. And it can also cache Rust code, which could be useful in the future (rust-lang/rust#136942 - although now there are no large wins).

It also supports caching PGO now, but since the PGO profiles are always different, it won't make any real difference.

rust-lang/rust#133076 previously tried to update the version to 0.3 (CC `@klensy)`

r? `@marcoieni`

Author: bors