Update to escape-string-regexp@4.0.0

From https://github.com/secretlint/secretlint/issues/285
Related: https://github.com/sindresorhus/escape-string-regexp/pull/21
`-` escaping is incompatible `u` flag

https://github.com/sindresorhus/escape-string-regexp/releases/tag/v4.0.0