Merge pull request #1324 from rust-lang/renovate/rust-1.x

Update dependency rust to v1.78.0

Author: Mark-Simulacrum

.github/workflows/main.yml

@@ -7,7 +7,7 @@ on:
 
 env:
   # renovate: datasource=github-tags depName=rust lookupName=rust-lang/rust
-  RUST_VERSION: 1.77.2
+  RUST_VERSION: 1.78.0
 
 jobs:
   lint: