Bump cc version in bootstrap
Among other changes, the newer cc release pulls in this fix:
https://github.com/rust-lang/cc-rs/commit/
b2792e33ff91b92e2e920e54d582b0c334670c37
This fixes errors when building compiler_builtins for UEFI targets.
[[package]]
name = "cc"
-version = "1.0.69"
+version = "1.0.73"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e70cc2f62c6ce1868963827bd677764c62d07c3d9a3e1fb1177ee1a9ab199eb2"
+checksum = "2fff2a6927b3bb87f9595d67196a70493f627687a71d87a0d692242c33f58c11"
dependencies = [
"jobserver",
]