fix: cacache build without async runtime by enabling tokio-runtime

[ognis1205]

Description

Enable the tokio-runtime feature for the cacache dependency in git-cliff-core.

Motivation and Context

In the workspace root, cacache is already resolved with an async runtime enabled due to transitive dependencies from the CLI:

$ cargo tree -f "{p} {f}" | grep cacache
├── cacache v13.1.0 futures,libc,memmap2,mmap,tokio,tokio-runtime,tokio-stream
├── http-cache-reqwest v0.15.0 default,manager-cacache
│   ├── http-cache v0.20.0 bincode,cacache,cacache-tokio,manager-cacache
│   │   ├── cacache v13.1.0 futures,libc,memmap2,mmap,tokio,tokio-runtime,tokio-stream (*)

However, when building git-cliff-core in isolation, cacache is currently resolved without any async runtime enabled:

$ cargo tree -f "{p} {f}" | grep cacache
├── cacache v13.0.0 libc,memmap2,mmap

As a result, cargo build succeeds at the workspace level, but cargo msrv -p git-cliff-core check fails due to missing runtime-dependent types in cacache.

Additional context

• chore(deps): bump cacache from 13.0.0 to 13.1.0 in the minor group across 1 directory #1328
• Bug: State is undefined when neither tokio nor async-std features are enabled zkat/cacache-rs#92

How Has This Been Tested?

• cargo build for git-cliff-core
• cargo build for the workspace
• cargo msrv to verify the configuration builds correctly under MSRV constraints

Screenshots / Logs (if applicable)

N/A

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.43%. Comparing base (081ba68) to head (a6194f1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1341   +/-   ##
=======================================
  Coverage   43.43%   43.43%           
=======================================
  Files          23       23           
  Lines        2245     2245           
=======================================
  Hits          975      975           
  Misses       1270     1270           

Flag	Coverage Δ
unit-tests	43.43% <ø> (ø)

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[orhun]

thanks for investigating this!

[ognis1205]

thanks for investigating this!

Ideally, this should be addressed upstream in cacache, but I hope this can serve as a temporary workaround until that is resolved.