fix: add chrono back in stackslib tests

Author: hugocaillard

Cargo.lock

@@ -44,6 +44,7 @@ url = "2.1.0"
 percent-encoding = "2.1.0"
 prometheus = { version = "0.9", optional = true }
 slog = { version = "2.5.2", features = [ "max_level_trace" ] }
+chrono = { version = "0.4.19", optional = true }
 clarity = { path = "../clarity" }
 stacks-common = { path = "../stacks-common" }
 pox-locking = { path = "../pox-locking" }
@@ -90,6 +91,7 @@ rstest = "0.17.0"
 rstest_reuse = "0.5.0"
 mutants = "0.0.3"
 rlimit = "0.10.2"
+chrono = "0.4.19"
 
 [features]
 default = []
@@ -98,7 +100,7 @@ disable-costs = []
 developer-mode = ["clarity/developer-mode"]
 monitoring_prom = ["prometheus"]
 slog_json = ["stacks-common/slog_json", "clarity/slog_json", "pox-locking/slog_json"]
-testing = []
+testing = ["chrono"]
 
 [target.'cfg(all(any(target_arch = "x86_64", target_arch = "x86", target_arch = "aarch64"), not(any(target_os="windows"))))'.dependencies]
 sha2 = { version = "0.10", features = ["asm"] }