Update ttf-parser requirement from 0.20.0 to 0.25.1

Updates the requirements on [ttf-parser](https://github.com/harfbuzz/ttf-parser) to permit the latest version.
- [Release notes](https://github.com/harfbuzz/ttf-parser/releases)
- [Changelog](https://github.com/harfbuzz/ttf-parser/blob/main/CHANGELOG.md)
- [Commits](harfbuzz/ttf-parser@v0.20.0...v0.25.1)

---
updated-dependencies:
- dependency-name: ttf-parser
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

plotters/Cargo.toml

@@ -37,7 +37,7 @@ optional = true
 path = "../plotters-svg"
 
 [target.'cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))'.dependencies]
-ttf-parser = { version = "0.20.0", optional = true }
+ttf-parser = { version = "0.25.1", optional = true }
 lazy_static = { version = "1.4.0", optional = true }
 pathfinder_geometry = { version = "0.5.1", optional = true }
 font-kit = { version = "0.14.2", optional = true }