Bump proptest from 1.5.0 to 1.6.0 (#3437)

Bumps [proptest](https://github.com/proptest-rs/proptest) from 1.5.0 to
1.6.0.
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src/core/Cargo.toml

@@ -66,7 +66,7 @@ vec-collections = "0.4.3"
 
 [dev-dependencies]
 codspeed-criterion-compat = "2.7.2"
-proptest = { version = "1.5.0", default-features = false, features = ["std"]}
+proptest = { version = "1.6.0", default-features = false, features = ["std"]}
 rand = "0.8.2"
 tempfile = "3.14.0"