Relax version requirements

This includes working with both itertools 0.11 and the recently released
itertools 0.12. Strictly these are SemVer incompatible, but the changes
don't affect those parts of itertools that are used by petnames.

Cargo.toml

@@ -31,16 +31,16 @@ default-rng = ["rand/std", "rand/std_rng"]
 default-words = []
 
 [dev-dependencies]
-anyhow = "^1.0.75"
-tempdir = "^0.3.7"
+anyhow = "1"
+tempdir = "0.3"
 
 [build-dependencies]
-anyhow = "^1.0.75"
+anyhow = "1"
 
 [dependencies]
-clap = { version = "^4.4.2", features = ["cargo", "derive"], optional = true }
-itertools = { version = "^0.11.0", default-features = false }
-rand = { version = "^0.8.5", default-features = false }
+clap = { version = "4.4", features = ["cargo", "derive"], optional = true }
+itertools = { version = ">=0.11", default-features = false }
+rand = { version = "0.8", default-features = false }
 
 [package.metadata.docs.rs]
 # Limit docs.rs builds to a single tier one target, because they're identical on