Bump png from 0.17.16 to 0.18.0

Bumps [png](https://github.com/image-rs/image-png) from 0.17.16 to 0.18.0.
- [Changelog](https://github.com/image-rs/image-png/blob/master/CHANGES.md)
- [Commits](https://github.com/image-rs/image-png/commits)

---
updated-dependencies:
- dependency-name: png
  dependency-version: 0.18.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -29,7 +29,7 @@ itertools = "0.14"
 libm = "0.2.15" # erf
 ndarray = "0.16.1"
 num-traits = "0.2.14"
-png = { version = "0.17.16", optional = true }
+png = { version = "0.18.0", optional = true }
 serde = { version = "1", features = ["derive"], optional = true }
 thiserror = "2"