Update askama to 0.14.0 version (rust-lang#14888)

No breaking changes for clippy in this update (which only impacts the
lint page).

The askama release information is
[here](https://github.com/askama-rs/askama/releases/tag/v0.14.0).

r? @samueltardieu

changelog: update askama version to `0.14.0`

Author: samueltardieu

Cargo.toml

@@ -42,7 +42,7 @@ walkdir = "2.3"
 filetime = "0.2.9"
 itertools = "0.12"
 pulldown-cmark = { version = "0.11", default-features = false, features = ["html"] }
-askama = { version = "0.13", default-features = false, features = ["alloc", "config", "derive"] }
+askama = { version = "0.14", default-features = false, features = ["alloc", "config", "derive"] }
 
 # UI test dependencies
 if_chain = "1.0"