libppd 2.1.0

[tillkamppeter]

Security bug fix release. Early release of 2.1.0 to fix CVE-2024-47175.

• Prevent PPD generation based on invalid IPP response
  Overtaken from CUPS 2.x: Validate IPP attributes in PPD generator, refactor make-and-model code, PPDize preset and template names, quote PPD localized strings. Fixes CVE-2024-47175.

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This discussion was created from the release libppd 2.1.0.