Merge pull request #1392 from rust-lang/dependabot/cargo/once_cell-1.8.0

Bump once_cell from 1.7.2 to 1.8.0

Cargo.lock

@@ -1039,9 +1039,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.7.2"
+version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af8b08b04175473088b46763e51ee54da5f9a164bc162f615b91bc179dbf15a3"
+checksum = "692fcb63b64b1758029e0a96ee63e049ce8c5948587f2f7208df04625e5f6b56"
 
 [[package]]
 name = "opaque-debug"