CI Failures on MSRV.

[thomcc]

Unsure why CI is failing on 1.43. Cargo is failing with error reading from the zlib stream; class=Zlib (5):

cargo test --no-default-features --verbose 
  shell: /usr/bin/bash -e {0}
  env:
    RUST_BACKTRACE: short
    CARGO_INCREMENTAL: 0
    CARGO_NET_RETRY: 10
    RUSTUP_MAX_RETRIES: 10
    RUSTFLAGS: --cfg msrv
    RUSTDOCFLAGS: -Dwarnings
    CARGO: cargo
    TARGET: 
    Updating crates.io index
error: failed to get `serde` as a dependency of package `arcstr v1.1.4 (/home/runner/work/arcstr/arcstr)`

Caused by:
  failed to load source for dependency `serde`

Caused by:
  Unable to update registry `[https://github.com/rust-lang/crates.io-index`](https://github.com/rust-lang/crates.io-index%60)

Caused by:
  failed to fetch `[https://github.com/rust-lang/crates.io-index`](https://github.com/rust-lang/crates.io-index%60)

Caused by:
  error reading from the zlib stream; class=Zlib (5)

Full action is https://github.com/thomcc/arcstr/actions/runs/2750724741 (https://github.com/thomcc/arcstr/runs/7551839057?check_suite_focus=true may be a better link).