Update Rust crate pest_derive to v2.1.0

Author: renovate-bot

squark-macros/Cargo.toml

@@ -15,7 +15,7 @@ proc-macro = true
 
 [dependencies]
 pest = "2.1.2"
-pest_derive = "2.0.0"
+pest_derive = "2.1.0"
 
 [dev-dependencies]
 squark = { path = "../squark", version = "0.7.0" }