Refactor ci flow

[yanganto]

Fix MSRV issue of #178

• Bumps MSRV
• CI will use MSRV from Rust manifest (Cargo.toml)
• reduce using actions-rs, which is no longer maintained after Oct 13, 2023.
• Reduce usage of actions-rs, which are no longer maintained after Oct 13, 2023.
• Set up dependency upgrade bot
• Refactor lint, test, build with Nix
• Allow codecov upload failure

[yanganto]

@dr-orlovsky
Please be kindly reminded.
This PR will go into v0.11 not master, and solve the trivial CI issues.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (develop@8ee3144). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff            @@
##             develop   #181   +/-   ##
========================================
  Coverage           ?   9.1%           
========================================
  Files              ?     37           
  Lines              ?   6699           
  Branches           ?      0           
========================================
  Hits               ?    612           
  Misses             ?   6087           
  Partials           ?      0           

Flag	Coverage Δ
rust	9.1% <ø> (?)

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[yanganto]

The codecov sometimes works and sometimes does not, because there is a quota limitation on tokenless usage.

error - 2024-04-23 09:04:16,536 -- Upload failed: {"detail":"Tokenless has reached GitHub rate limit. Please upload using a token: https://docs.codecov.com/docs/adding-the-codecov-token. Expected available in 520 seconds."}

[dr-orlovsky]

ACK 740bbd4