fix: made clippy pass for old rust versions

Using write! instead of list_str.push_str

build.rs

@@ -25,6 +25,7 @@
 /// ```
 use chrono::Utc;
 use regex::Regex;
+use std::fmt::Write as _;
 use std::fs::{File, OpenOptions};
 use std::io::Write;
 use std::path::Path;
@@ -140,7 +141,7 @@ where
 {
     let mut list_str = String::new();
     for value in &vec {
-        list_str.push_str(&format!("\"{}\", ", value))
+        write!(&mut list_str, "\"{}\", ", value).unwrap();
     }
     list_str.pop();
     writeln!(