* Add experimental concurrent cache support
* chore: replace is-terminal with standard library (#2311)
* prepare release 0.9.1
* Add support for caching target json specs for Rust compilation. (#2269)
* Don't use CARGO_REGISTRIES_* configuration in hash keys (#2308)
* fix: bring "cargo build -Zprofile" support back (#2306)
* deps: Update cc
* add test for #2299
* fix test_rlib_dep_reader_call failure when $CARGO_HOME isn't in the user's $HOME
* Never cache the outer CUDA compilation (because `nvcc -E` can't be trusted). Always decompose via `nvcc --dryrun`, then cache and report the host compiler call as a CUDA compilation
* Always use sccache's own jobserver
* Adjust placement of crate dependencies and a comment Crates memmap2, object and shlex are not dist-only requirements.
* Skip tests when needed features (gcs & s3) are disabled
OBS-URL: https://build.opensuse.org/package/show/devel:languages:rust/sccache?expand=0&rev=72
