chore: prepare loom 0.5.2

[Darksonn]

0.5.2 (October 7, 2021)

Added

• Add a loom::cell::Cell, which provides a basic wrapper of the loom UnsafeCell (Add a loom::cell::Cell, which provides a basic wrapper of the loom UnsafeCell #196)
• Arc counter manipulations (Arc counter manipulations #225)
• Implement Mutex::into_inner and RwLock::into_inner (Implement Mutex::into_inner and RwLock::into_inner #215)
• Implement Release, AcqRel, and SeqCst fences (Implement Release, AcqRel, and SeqCst fences #220)
• Arc::as_ptr added (Arc::as_ptr #230)
• Arc::pin added (Arc::pin added #224)

Changed

• Remove implicit T: Sized requirement from UnsafeCell (Remove implicit T: Sized requirement from UnsafeCell #222)
• Update tracing (Improve logging #2 #227)

[carllerche]

Awesome thanks