fix: enable unicode-case feature of regex

to fix failures in binding generation.

We use case-inensistive regex patterns while calling allowlist_file() at some
places. This does not work without the unicode-case feature. In the past it
used to be enabled by tracing-subscriber which served our allowlist-file()
use-case as well by accident. But the new version of tracing-subscriber
has removed the dependency on the regex crate thereboy breaking our
bindgen code.

In this fix we have added an explicit depenency on regex ourselves with
said feature enabled.

Author: gurry

Cargo.lock

@@ -52,6 +52,7 @@ predicates = "3.1.0"
 pretty_assertions = "1.4.1"
 proc-macro2 = "1.0.94"
 quote = "1.0.40"
+regex = "1.11.1"
 rustversion = "1.0.20"
 scratch = "1.0"
 semver = "1.0.26"