build(deps): bump smallvec from 1.11.2 to 1.12.0

Bumps [smallvec](https://github.com/servo/rust-smallvec) from 1.11.2 to 1.12.0.
- [Release notes](https://github.com/servo/rust-smallvec/releases)
- [Commits](servo/rust-smallvec@v1.11.2...v1.12.0)

---
updated-dependencies:
- dependency-name: smallvec
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -31,7 +31,7 @@ ffi = { package = "glib-sys", path = "sys" }
 gobject_ffi = { package = "gobject-sys", path = "gobject-sys" }
 glib-macros = { path = "../glib-macros" }
 rs-log = { package = "log", version = "0.4", optional = true }
-smallvec = { version = "1.11", features = ["union", "const_generics", "const_new"] }
+smallvec = { version = "1.12", features = ["union", "const_generics", "const_new"] }
 thiserror = "1"
 gio_ffi = { package = "gio-sys", path = "../gio/sys", optional = true }
 memchr = "2.7.1"