[WIP] bazel/macos: Bump version -> 7 and update `rules_python`

[phlax]

@PiotrSikora not sure how to proceed with this

afaict it needs cargo-raze to be rerun - which errors when i try it with

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { kind: Io(NotFound), source: Some(Os { code: 2, kind: NotFound, message: "No such file or directory" }) }', /home/phlax/.cargo/registry/src/github.com-1ecc6299db9ec823/cargo-raze-0.14.1/src/rendering/bazel.rs:68:77

i would have tried updating cargo-raze but that is not currently possible #388

[phlax]

hmm

$ mkdir /tmp/cargo-raze/doesnt/exist/ -p

seems to have unlocked the next level

[phlax]

altho presumably its cargo-raze that is generating the no longer existing cargo_build_script fun

[phlax]

crate_universe docs are here http://bazelbuild.github.io/rules_rust/crate_universe.html

[phlax]

just spotted https://github.com/proxy-wasm/proxy-wasm-rust-sdk/pull/181 also

[martijneken]

Will take a look at this next (bumping Bazel, rules_rust, rules_python).