tools: use open instead of codecs.open in cpplint

[y-okt]

Fixes: #60771

The following error is observed with Python 3.14. The reason is that codecs.open() is deprecated, and we want to use open() instead.

Running C++ linter...
/Users/mzasso/git/nodejs/node/tools/cpplint.py:6709: DeprecationWarning: codecs.open() is deprecated. Use open() instead.
  with codecs.open(cfg_file, 'r', 'utf8', 'replace') as file_handle:
/Users/mzasso/git/nodejs/node/tools/cpplint.py:6812: DeprecationWarning: codecs.open() is deprecated. Use open() instead.
  with codecs.open(filename, 'r', 'utf8', 'replace') as target_file:
/Users/mzasso/git/nodejs/node/tools/cpplint.py:6182: DeprecationWarning: codecs.open() is deprecated. Use open() instead.
  with io.open(filename, 'r', 'utf8', 'replace') as headerfile: