agent: Update rust version for tokio
This was fixed for tokio's version
requirements for rust, see:
Fixes:
@@ -249,7 +249,7 @@ languages:
rust:
description: "Rust language"
notes: "'version' is the default minimum version used by this project."
- version: "1.38.0"
+ version: "1.45.0"
meta:
description: |
'newest-version' is the latest version known to work when
