Bump proptest from 0.9.6 to 1.0.0

Bumps [proptest](https://github.com/altsysrq/proptest) from 0.9.6 to 1.0.0.
- [Release notes](https://github.com/altsysrq/proptest/releases)
- [Changelog](https://github.com/AltSysrq/proptest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/altsysrq/proptest/compare/0.9.6...1.0.0)

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

taskchampion/Cargo.toml

@@ -24,5 +24,5 @@ log = "^0.4.14"
 tindercrypt = { version = "^0.2.2", default-features = false }
 
 [dev-dependencies]
-proptest = "^0.9.4"
+proptest = "^1.0.0"
 tempdir = "^0.3.7"