build(deps): update femtovg requirement from 0.7 to 0.8

Updates the requirements on [femtovg](https://github.com/femtovg/femtovg) to permit the latest version.
- [Release notes](https://github.com/femtovg/femtovg/releases)
- [Changelog](https://github.com/femtovg/femtovg/blob/master/CHANGELOG.md)
- [Commits](femtovg/femtovg@v0.7.0...v0.8.0)

---
updated-dependencies:
- dependency-name: femtovg
  dependency-type: direct:production
...

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

Author: dependabot[bot]

examples/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 [dependencies]
 chrono = "0.4"
 
-femtovg = { version = "0.7", optional = true, default-features = false }
+femtovg = { version = "0.8", optional = true, default-features = false }
 glium = { version = "0.32", optional = true, default-features = false }
 glow = { version = "0.12.0", optional = true }
 epoxy = { version = "0.1.0", optional = true }