update to go1.23, update golangci-lint to v1.62, fix linting issues

[thaJeztah]

fix linting issues (revive)

clidocstool_yaml_test.go:63:60: unused-parameter: parameter 'err' seems to be unused, consider removing or renaming it as _ (revive)
    filepath.Walk(tmpdir, func(path string, info fs.FileInfo, err error) error {
                                                              ^
clidocstool_man_test.go:80:60: unused-parameter: parameter 'err' seems to be unused, consider removing or renaming it as _ (revive)
    filepath.Walk(tmpdir, func(path string, info fs.FileInfo, err error) error {
                                                              ^
clidocstool_test.go:52:31: unused-parameter: parameter 'cmd' seems to be unused, consider removing or renaming it as _ (revive)
        Run:                   func(cmd *cobra.Command, args []string) {},
                                    ^
clidocstool_md_test.go:65:60: unused-parameter: parameter 'err' seems to be unused, consider removing or renaming it as _ (revive)
    filepath.Walk(tmpdir, func(path string, info fs.FileInfo, err error) error {
                                                              ^
clidocstool_test.go:68:13: unused-parameter: parameter 'cmd' seems to be unused, consider removing or renaming it as _ (revive)
        Run: func(cmd *cobra.Command, args []string) {},
                  ^
clidocstool_test.go:89:17: unused-parameter: parameter 'cmd' seems to be unused, consider removing or renaming it as _ (revive)
        Run:     func(cmd *cobra.Command, args []string) {},
                      ^
clidocstool_yaml.go:80:19: unused-parameter: parameter 's' seems to be unused, consider removing or renaming it as _ (revive)
    emptyStr := func(s string) string { return "" }
                     ^

update golangci-lint to v1.62

Update config file for the new version, and removed some linters that were
deprecated and removed;

WARN The linter 'varcheck' is deprecated (since v1.49.0) due to: The owner seems to have abandoned the linter. Replaced by unused.
ERRO [linters_context] deadcode: This linter is fully inactivated: it will not produce any reports.
ERRO [linters_context] varcheck: This linter is fully inactivated: it will not produce any reports.

update to go1.23

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.73%. Comparing base (a33364e) to head (e3fec08).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #60   +/-   ##
=======================================
  Coverage   67.73%   67.73%           
=======================================
  Files           5        5           
  Lines         623      623           
=======================================
  Hits          422      422           
  Misses        139      139           
  Partials       62       62           

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