ci: Fix deprecation warnings of golangci-lint

[mkilchhofer]

This PR fixes these deprecation warnings:

$ golangci-lint-1.59.1 run
WARN [config_reader] The configuration option `linters.errcheck.ignore` is deprecated, please use `linters.errcheck.exclude-functions`.
WARN [config_reader] The configuration option `linters.gomnd.settings` is deprecated. Please use the options `linters.gomnd.checks`,`linters.gomnd.ignored-numbers`,`linters.gomnd.ignored-files`,`linters.gomnd.ignored-functions`.
WARN [lintersdb] The name "vet" is deprecated. The linter has been renamed to: govet.
WARN [lintersdb] The name "vetshadow" is deprecated. The linter has been renamed to: govet.
WARN The linter 'gomnd' is deprecated (since v1.58.0) due to: The linter has been renamed. Replaced by mnd.

Note for reviewers:

• Disable whitespace diff :)