build(deps): bump mockall from 0.12.1 to 0.13.0

Bumps [mockall](https://github.com/asomers/mockall) from 0.12.1 to 0.13.0.
- [Changelog](https://github.com/asomers/mockall/blob/master/CHANGELOG.md)
- [Commits](asomers/mockall@v0.12.1...v0.13.0)

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

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

Cargo.toml

@@ -80,7 +80,7 @@ lazy_static = { version = "1.5.0", optional = true }
 [dev-dependencies]
 test-case = "3.3.1"
 pretty_assertions = "1.4.0"
-mockall = "0.12.1"
+mockall = "0.13.0"
 
 # We need the backtrace feature to enable snapshot name generation in
 # single-threaded tests (tests using cargo cross run single-threaded due to