Bump plotters-cairo from 0.6.0 to 0.7.0

Bumps [plotters-cairo](https://github.com/plotters-rs/plotters-cairo) from 0.6.0 to 0.7.0.
- [Commits](https://github.com/plotters-rs/plotters-cairo/commits/v0.7.0)

---
updated-dependencies:
- dependency-name: plotters-cairo
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -15,4 +15,4 @@ default_features = false
 features = ["surface_series"]
 
 [dependencies.plotters-cairo]
-version = "0.6.0"
+version = "0.7.0"