Use MacOs-12 as build system in CI

[atimin]

Closes #

Please check if the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• CHANGELOG.md have been updated (for bug fixes / features / docs)

What kind of change does this PR introduce?

Update

What is the current behavior?

We build and test for Macos-11, but the current version is macos-12

What is the new behavior?

We use macos-12 in the pipelines

Does this PR introduce a breaking change?

No

Other information:

It is possible after #32

[codecov-commenter]

Codecov Report

Base: 85.18% // Head: 85.18% // No change to project coverage 👍

Coverage data is based on head (4fda28f) compared to base (0d50dc1).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #33   +/-   ##
========================================
  Coverage    85.18%   85.18%           
========================================
  Files            3        3           
  Lines           81       81           
========================================
  Hits            69       69           
  Misses          12       12           

Flag	Coverage Δ
unittests	85.18% <ø> (ø)

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