Update askama version to 0.15 in generate-copyright

Author: GuillaumeGomez

Cargo.lock

@@ -1566,7 +1566,7 @@ name = "generate-copyright"
 version = "0.1.0"
 dependencies = [
  "anyhow",
- "askama 0.14.0",
+ "askama 0.15.0",
  "cargo_metadata 0.21.0",
  "serde",
  "serde_json",

src/tools/generate-copyright/Cargo.toml

@@ -8,7 +8,7 @@ description = "Produces a manifest of all the copyrighted materials in the Rust
 
 [dependencies]
 anyhow = "1.0.65"
-askama = "0.14.0"
+askama = "0.15.0"
 cargo_metadata = "0.21"
 serde = { version = "1.0.147", features = ["derive"] }
 serde_json = "1.0.85"