Bump once_cell from 1.12.0 to 1.12.1

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.12.0 to 1.12.1.
- [Release notes](https://github.com/matklad/once_cell/releases)
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](https://github.com/matklad/once_cell/compare/v1.12.0...v1.12.1)

---
updated-dependencies:
- dependency-name: once_cell
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Cargo.lock

@@ -525,9 +525,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.12.0"
+version = "1.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7709cef83f0c1f58f666e746a08b21e0085f7440fa6a29cc194d68aac97a4225"
+checksum = "ac8b1a9b2518dc799a2271eff1688707eb315f0d4697aa6b0871369ca4c4da55"
 
 [[package]]
 name = "pacmanconf"

Cargo.toml

@@ -11,7 +11,7 @@ alpm-utils = "1.1.2"
 pacmanconf = "1.0.0"
 
 subprocess = "0.2.9"
-once_cell = "1.12.0"
+once_cell = "1.12.1"
 gettext-rs = { version = "0.7", features = ["gettext-system"] }
 gtk = { version = "0.15.5", features = ["v3_24_30"] }
 gio = { version = "0.15.12", features = ["v2_72"] }