Update convert_case requirement from 0.7.1 to 0.8.0 (#810)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

scripts/gentest/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Emil Sjölander <[email protected]>"]
 edition = "2018"
 
 [dependencies]
-convert_case = "0.7.1"
+convert_case = "0.8.0"
 env_logger = "0.10.0"
 fantoccini = "0.21.0"
 log = "0.4"