prometheus: release 0.13.4

[lucab]

Changelog for 0.13.4

• Improvement: Add PullingGauge (Add PullingGauge gauge type #405)

• Improvement: Let cargo know which example requires which features (cargo/examples: add required-features annotations #511)

• Bug fix: Prevent clippy::ignored_unit_patterns in macro expansions (Prevent clippy::ignored_unit_patterns in macro expansions #497)

• Internal change: Add CI job for minimum toolchain (MSRV) (ci: add a job for minimum toolchain (MSRV) #467)

• Internal change: Update CI to actions/checkout@v4 (ci: Update to actions/checkout@v4. #499)

• Internal change: Update dependencies

[lucab]

I manually checked the version bump with https://github.com/obi1kenobi/cargo-semver-checks:

rust-prometheus$ cargo semver-checks --all-features
     Parsing prometheus v0.13.4 (current)
      Parsed [   8.524s] (current)
     Parsing prometheus v0.13.3 (baseline)
      Parsed [   9.273s] (baseline)
    Checking prometheus v0.13.3 -> v0.13.4 (minor change)
     Checked [   0.132s] 66 checks; 66 passed, 6 unnecessary
    Finished [  17.947s] prometheus

[lucab]

/cc @BusyJay for review.

[lucab]

Tagged: https://github.com/tikv/rust-prometheus/releases/tag/v0.13.4
Published: https://crates.io/crates/prometheus/0.13.4