Update cookie requirement from 0.15 to 0.16

Updates the requirements on [cookie](https://github.com/SergioBenitez/cookie-rs) to permit the latest version.
- [Release notes](https://github.com/SergioBenitez/cookie-rs/releases)
- [Changelog](https://github.com/SergioBenitez/cookie-rs/blob/master/CHANGELOG.md)
- [Commits](rwf2/cookie-rs@0.15.0...0.16.0)

---
updated-dependencies:
- dependency-name: cookie
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

examples/cookies/introduction/Cargo.toml

@@ -8,4 +8,4 @@ edition = "2018"
 
 [dependencies]
 gotham = { path = "../../../gotham" }
-cookie = "0.15"
+cookie = "0.16"

examples/sessions/custom_data_type/Cargo.toml

@@ -9,6 +9,6 @@ edition = "2018"
 [dependencies]
 gotham = { path = "../../../gotham" }
 
-cookie = "0.15"
+cookie = "0.16"
 serde = { version = "1.0", features = ["derive"] }
 time = { version = "0.3.0", features = ["formatting", "local-offset"] }

examples/sessions/introduction/Cargo.toml

@@ -8,4 +8,4 @@ edition = "2018"
 
 [dependencies]
 gotham = { path = "../../../gotham" }
-cookie = "0.15"
+cookie = "0.16"

gotham/Cargo.toml

@@ -33,7 +33,7 @@ anyhow = "1.0"
 base64 = "0.13"
 bincode = { version = "1.0", optional = true }
 bytes = "1.0"
-cookie = "0.15"
+cookie = "0.16"
 futures-util = "0.3.14"
 httpdate = "1.0"
 hyper = { version = "0.14.12", features = ["http1", "runtime", "server", "stream"] }