bpo-43542: Add heif/heic formats in mimetypes (GH-24917)

* bpo-43542: Add heif/heic formats in mimetypes

Add HEIF and HEIC format to list of media types. It has IANA registration.

IANA: https://www.iana.org/assignments/media-types/image/heic
HEIF Github: https://github.com/nokiatech/heif

Co-authored-by: Gregory P. Smith <greg@krypto.org>