build(deps): bump once_cell from 1.5.0 to 1.5.1

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.5.0 to 1.5.1.
- [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/v1.5.0...v1.5.1)

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

Cargo.lock

@@ -775,9 +775,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.5.0"
+version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95c43eba5c640051fbde86a3377842386a94281df3ff0a5f0365c2075ed5c66f"
+checksum = "f53cef67919d7d247eb9a2f128ca9e522789967ef1eb4ccd8c71a95a8aedf596"
 
 [[package]]
 name = "opaque-debug"