Update CI to use clang-format 11.0.0.

[ni4]

Commit 793e5b3 updates lint.yml for clang-format action, which started to use version 11.1.0 instead 11.0.0 by default, so this PR reverts this back to 11.0.0.
Also it updates macOS version runners.

@maxirmx Was this done by intension, i.e. are there any benefits of switching to 11.1.0? I'm not against it but just want to get aligned/update work setup.

Fixes #1975
Fixes #1976

[maxirmx]

@maxirmx Was this done by intension, i.e. are there any benefits of switching to 11.1.0? I'm not against it but just want to get aligned/update work setup.

No, it was not done by intention

[codecov]

Codecov Report

Base: 81.94% // Head: 81.94% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (c1fe95c) compared to base (cffcace).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1974   +/-   ##
=======================================
  Coverage   81.94%   81.94%           
=======================================
  Files         142      142           
  Lines       29225    29246   +21     
=======================================
+ Hits        23947    23966   +19     
- Misses       5278     5280    +2     

Impacted Files	Coverage Δ
src/lib/crypto/backend_version.cpp	100.00% <ø> (ø)
src/rnp/rnpcfg.cpp	82.77% <ø> (ø)
src/rnp/fficli.cpp	81.24% <0.00%> (-0.04%)	⬇️
src/rnp/rnp.cpp	81.63% <0.00%> (+0.88%)	⬆️

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[ronaldtse]

This change fixes:

• Remove macos-10.15 due to GitHub Actions runner deprecation in 2022-12 #1975
• Add macos-12.0 GitHub Actions to workflows #1976

[ronaldtse]

@ni4 if the macOS builds work then we can close both:

• Remove macos-10.15 due to GitHub Actions runner deprecation in 2022-12 #1975
• Add macos-12.0 GitHub Actions to workflows #1976

Thanks!

[ni4]

@ronaldtse yeah, let's just wait for the macOS 12 jobs to be picked up and handled.

[ni4]

Merging as this is just CI change and all is green.