Update parking_lot requirement from 0.11 to 0.12

[dependabot[bot]]

Updates the requirements on parking_lot to permit the latest version.

Changelog

Sourced from parking_lot's changelog.

parking_lot 0.12.0, parking_lot_core 0.9.0, lock_api 0.4.6 (2022-01-28)

• The MSRV is bumped to 1.49.0.
• Disabled eventual fairness on wasm32-unknown-unknown. (#302)
• Added a rwlock method to report if lock is held exclusively. (#303)
• Use new asm! macro. (#304)
• Use windows-rs instead of winapi for faster builds. (#311)
• Moved hardware lock elision support to a separate Cargo feature. (#313)
• Removed used of deprecated spin_loop_hint. (#314)

parking_lot 0.11.2, parking_lot_core 0.8.4, lock_api 0.4.5 (2021-08-28)

• Fixed incorrect memory orderings on RwLock and WordLock. (#294, #292)
• Added Arc-based lock guards. (#291)
• Added workaround for TSan's lack of support for fence. (#292)

lock_api 0.4.4 (2021-05-01)

• Update for latest nightly. (#281)

lock_api 0.4.3 (2021-04-03)

• Added [Raw]ReentrantMutex::is_owned. (#280)

parking_lot_core 0.8.3 (2021-02-12)

• Updated smallvec to 1.6. (#276)

parking_lot_core 0.8.2 (2020-12-21)

• Fixed assertion failure on OpenBSD. (#270)

parking_lot_core 0.8.1 (2020-12-04)

• Removed deprecated CloudABI support. (#263)
• Fixed build on wasm32-unknown-unknown. (#265)
• Relaxed dependency on smallvec. (#266)

parking_lot 0.11.1, lock_api 0.4.2 (2020-11-18)

• Fix bounds on Send and Sync impls for lock guards. (#262)
• Fix incorrect memory ordering in RwLock. (#260)

lock_api 0.4.1 (2020-07-06)

• Add data_ptr method to lock types to allow unsafely accessing the inner data without a guard. (#247)

parking_lot 0.11.0, parking_lot_core 0.8.0, lock_api 0.4.0 (2020-06-23)

... (truncated)

Commits

• a75875b Release parking_lot 0.12.0, parking_lot_core 0.9.0, lock_api 0.4.6
• 78a16dd Minor fixes
• 4d64bc6 Merge pull request #314 from Amanieu/spin_loop
• a4e4a02 Only run CI for bors and pull requests
• 930caab Use core::hint::spin_loop instead of the deprecated spin_loop_hint.
• b3c9290 Merge pull request #313 from Amanieu/hle_feature
• b271f84 Move hardware lock elision support to a separate Cargo feature
• 8019473 Merge pull request #311 from clemenswasser/adopt-windows-rs
• 1f94288 Adopt windows-rs
• c73dd43 Merge pull request #309 from Amanieu/stable_asm
• Additional commits viewable in compare view

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[dependabot[bot]]

A newer version of parking_lot exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.