Bump rstest from 0.14.0 to 0.15.0

Bumps [rstest](https://github.com/la10736/rstest) from 0.14.0 to 0.15.0.
- [Release notes](https://github.com/la10736/rstest/releases)
- [Changelog](https://github.com/la10736/rstest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/la10736/rstest/compare/0.14.0...0.15.0)

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

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

Cargo.lock

@@ -1581,9 +1581,9 @@ dependencies = [
 
 [[package]]
 name = "rstest"
-version = "0.14.0"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "86fcf8fa7e9f3b396a5967d7455c057532a81be5114c81d5b02fae9a1f8e21d7"
+checksum = "e9c9dc66cc29792b663ffb5269be669f1613664e69ad56441fdb895c2347b930"
 dependencies = [
  "futures",
  "futures-timer",

rust/taskchampion/Cargo.toml

@@ -29,5 +29,5 @@ ring = "0.16"
 [dev-dependencies]
 proptest = "^1.0.0"
 tempfile = "3"
-rstest = "0.14"
+rstest = "0.15"
 pretty_assertions = "1"