Update ansi_term requirement from 0.11.0 to 0.12.0

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/commits)

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

Author: dependabot-preview[bot]

macros/Cargo.toml

@@ -17,7 +17,7 @@ proc-macro = true
 
 [dependencies]
 lalrpop-util = "0.17.0"
-ansi_term = "0.11.0"
+ansi_term = "0.12.0"
 proc-macro2 = { version = "0.4.24", features = ["nightly"] }
 proc-macro-hack = "0.5.2"
 quote = "0.6.10"