EXP: try pinning maturin to <1.3.0 to fix dev build CI

[ctb]

As of 17 hours ago (so, like, midnight PDT on Oct 2?), "Dev env instructions" build is failing.

The error might belong to maturin - here is the message:

Processing ./.tox/.tmp/package/1/sourmash-4.8.5.dev0.tar.gz
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'done'
  Preparing metadata (pyproject.toml): started
  Preparing metadata (pyproject.toml): finished with status 'error'
  error: subprocess-exited-with-error
  
  × Preparing metadata (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [12 lines of output]
      error: current package believes it's in a workspace when it's not:
      current:   /tmp/pip-req-build-x9u8ulfq/src/core/Cargo.toml
      workspace: /tmp/pip-req-build-x9u8ulfq/Cargo.toml
      
      this may be fixable by adding `src/core` to the `workspace.members` array of the manifest located at: /tmp/pip-req-build-x9u8ulfq/Cargo.toml
      Alternatively, to keep it out of the workspace, add the package to the `workspace.exclude` array, or add an empty `[workspace]` table to the package's manifest.
      💥 maturin failed
        Caused by: Cargo metadata failed. Does your crate compile with `cargo build`?
        Caused by: `cargo metadata` exited with an error:
      Error running maturin: Command '['maturin', 'pep517', 'write-dist-info', '--metadata-directory', '/tmp/pip-modern-metadata-v0x443be', '--interpreter', '/home/runner/work/sourmash/sourmash/.tox/py39/bin/python']' returned non-zero exit status 1.
      Checking for Rust toolchain....
      Running `maturin pep517 write-dist-info --metadata-directory /tmp/pip-modern-metadata-v0x443be --interpreter /home/runner/work/sourmash/sourmash/.tox/py39/bin/python`
      [end of output]

Looking at the maturin releases, v1.3.0 was released yesterday, so maybe that's the problem? Trying out this PR as a temporary fix.

[codecov]

Codecov Report

Merging #2799 (a1e943e) into latest (ba1fd3e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           latest    #2799   +/-   ##
=======================================
  Coverage   85.94%   85.94%           
=======================================
  Files         130      130           
  Lines       14808    14808           
  Branches     2621     2621           
=======================================
  Hits        12727    12727           
  Misses       1780     1780           
  Partials      301      301           

Flag	Coverage Δ
hypothesis-py	25.82% <ø> (ø)
python	92.85% <ø> (ø)
rust	49.93% <ø> (ø)

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[ctb]

@sourmash-bio/devs ready for review - I'll merge this as a build fix next time I look at the PRs (this evening maybe?) unless there are objections.

[luizirber]

Better to fix the issue for now, but it is likely that maturin has better workspace support and we can change

sourmash/pyproject.toml

Line 134 in ba1fd3e

manifest-path = "src/core/Cargo.toml"

to point to Cargo.toml instead of src/core/Cargo.toml now