Replace normalize-strings dependency

[steffenkleinle]

Is your feature request related to a problem? Please describe.
We currently use normalize-strings to get rid of special characters. However, this library did not receive any updates in 4 years and can easily be replaced using String.normalize.

Describe the solution you'd like
Remove normalize-strings from our dependencies and replace the functionality as done in digitalfabrik/entitlementcard#1782:

// eslint-disable-next-line no-control-regex
const nonAsciiRegex = /[^\x00-\x7F]/g

const normalizeToAscii = (str: string): string => str.normalize('NFKD').replace(nonAsciiRegex, '')

const normalizeString = (str: string): string => normalizeToAscii(str).toLowerCase().trim()

export default normalizeString

Describe alternatives you've considered
Keep the current solution or look for other dependencies to do this.

Additional context
Done for the entitlementcard in digitalfabrik/entitlementcard#1782.