[style] update formatter to clang-format-14

[wgtdkp]

clang-format-14 is used by openthread and ot-br-posix, so just follow it.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 73.33%. Comparing base (de8e82c) to head (853974f).

❗ Current head 853974f differs from pull request most recent head bc818e1. Consider uploading reports for the commit bc818e1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #248      +/-   ##
==========================================
- Coverage   73.35%   73.33%   -0.03%     
==========================================
  Files          71       71              
  Lines        7420     7421       +1     
==========================================
- Hits         5443     5442       -1     
- Misses       1977     1979       +2     

Files	Coverage Δ
src/app/border_agent.cpp	92.50% <100.00%> (ø)
src/app/border_agent.hpp	100.00% <ø> (ø)
src/app/br_discover.cpp	89.47% <ø> (ø)
src/app/cli/interpreter.cpp	79.70% <100.00%> (ø)
src/app/cli/interpreter.hpp	100.00% <ø> (ø)
src/app/cli/job.cpp	100.00% <100.00%> (ø)
src/app/cli/job.hpp	100.00% <ø> (ø)
src/app/commissioner_app.hpp	100.00% <ø> (ø)
src/app/file_logger.hpp	100.00% <ø> (ø)
src/app/mdns_handler.cpp	85.71% <100.00%> (ø)
... and 19 more