build(deps): update ansi_term requirement from 0.11 to 0.12 (#816)

Updates the requirements on [ansi_term](https://github.com/ogham/rust-ansi-term) to permit the latest version.
- [Release notes](https://github.com/ogham/rust-ansi-term/releases)
- [Commits](https://github.com/ogham/rust-ansi-term/compare/v0.11.0...v0.12.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

examples/Cargo.toml

@@ -43,7 +43,7 @@ bytes = "0.5"
 clap = "2.33"
 
 # sloggish example
-ansi_term = "0.11"
+ansi_term = "0.12"
 humantime = "1.2"
 log = "0.4"
 

tracing-subscriber/Cargo.toml

@@ -41,7 +41,7 @@ lazy_static = { optional = true, version = "1" }
 
 # fmt
 tracing-log = { path = "../tracing-log", version = "0.1", optional = true, default-features = false, features = ["log-tracer", "std"] }
-ansi_term = { version = "0.11", optional = true }
+ansi_term = { version = "0.12", optional = true }
 chrono = { version = "0.4", optional = true }
 
 # only required by the json feature