feat: update to stable rust

[mattheworris]

Goal

The goal of this PR is update to rust stable toolchain.

Discussion

Checklist

• Chain spec updated
• Custom RPC OR Runtime API added/changed? Updated js/api-augment.
• Design doc(s) updated
• Tests added
• Benchmarks added
• Weights updated

[codecov]

Codecov Report

Merging #1655 (140f6a2) into main (5494f5b) will increase coverage by 14.50%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #1655       +/-   ##
===========================================
+ Coverage   73.35%   87.86%   +14.50%     
===========================================
  Files          49       46        -3     
  Lines        4924     4061      -863     
===========================================
- Hits         3612     3568       -44     
+ Misses       1312      493      -819     

Files Changed	Coverage Δ
pallets/capacity/src/lib.rs	87.98% <ø> (+33.79%)	⬆️
pallets/frequency-tx-payment/src/lib.rs	82.18% <ø> (+17.60%)	⬆️
pallets/handles/src/lib.rs	91.79% <ø> (+36.08%)	⬆️
pallets/messages/src/lib.rs	89.33% <ø> (+33.36%)	⬆️
pallets/msa/src/lib.rs	89.81% <ø> (+6.33%)	⬆️
pallets/schemas/src/lib.rs	85.40% <ø> (+36.42%)	⬆️
pallets/stateful-storage/src/lib.rs	86.09% <ø> (+7.67%)	⬆️
pallets/time-release/src/lib.rs	90.81% <ø> (+30.61%)	⬆️

... and 16 files with indirect coverage changes

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[wilwade]

Archiving