Update Rust crate prometheus to v0.14.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
prometheus	dependencies	minor	=0.13.4 -> =0.14.0

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Release Notes

tikv/rust-prometheus (prometheus)

v0.14.0

Compare Source

• API change: Use AsRef<str> for owned label values (#​537)

• Improvement: Hashing improvements (#​532)

• Dependency upgrade: Update hyper to 1.6 (#​524)

• Dependency upgrade: Update procfs to 0.17 (#​543)

• Dependency upgrade: Update protobuf to 3.7.2 for RUSTSEC-2024-0437 (#​541)

• Dependency upgrade: Update thiserror to 2.0 (#​534)

• Internal change: Fix LSP and Clippy warnings (#​540)

• Internal change: Bump MSRV to 1.81 (#​539)

• Documentation: Fix register_histogram_vec_with_registry docstring (#​528)

• Documentation: Fix typos in static-metric docstrings (#​479)

• Documentation: Add missing protobuf feature to README list (#​531)

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