minipng v. 1.0.0

- add `core::error::Error` implementation for `minipng::Error`, now that the `Error` trait is in `core`.
- upgrade to Edition 2024 (MSRV is now probably 1.85.0)
-----BEGIN PGP SIGNATURE-----
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=9IBf
-----END PGP SIGNATURE-----