Update uuid requirement from 0.7 to 0.8 (#364)

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Colin Bankier <colinbankier@gmail.com>
Co-authored-by: Dominic <git@msrd0.de>

gotham/Cargo.toml

@@ -36,7 +36,7 @@ mio = "0.7"
 borrow-bag = { path = "../misc/borrow_bag", version = "1.0" }
 percent-encoding = "2.1"
 pin-project = "0.4.2"
-uuid = { version = "0.7", features = ["v4"] }
+uuid = { version = "0.8", features = ["v4"] }
 chrono = "0.4"
 base64 = "0.12"
 rand = "0.6"