copyright: fix chrono deprecation

and use the recommended alternative. it has been deprecated since chrono
0.4.27[0]

0: https://github.com/chronotope/chrono/releases/tag/v0.4.27
1: chronotope/chrono#1175

Signed-off-by: Fabian Grünbichler <debian@fabian.gruenbichler.email>

src/debian/copyright.rs

@@ -1,5 +1,5 @@
 use cargo::core::manifest;
-use chrono::{DateTime, Datelike, NaiveDateTime, Utc};
+use chrono::{Datelike, NaiveDateTime, TimeZone, Utc};
 use git2::Repository;
 use regex;
 use tempfile;
@@ -318,19 +318,19 @@ fn copyright_fromgit(repo_url: &str) -> Result<String> {
     let first_commit = repo.find_commit(first_id)?;
     let latest_commit = repo.find_commit(latest_id)?;
 
-    let first_year = DateTime::<Utc>::from_utc(
-        NaiveDateTime::from_timestamp_opt(first_commit.time().seconds(), 0)
-            .ok_or(anyhow::Error::msg("lo"))?,
-        Utc,
-    )
-    .year();
-
-    let latest_year = DateTime::<Utc>::from_utc(
-        NaiveDateTime::from_timestamp_opt(latest_commit.time().seconds(), 0)
-            .ok_or(anyhow::Error::msg("lo"))?,
-        Utc,
-    )
-    .year();
+    let first_year = Utc
+        .from_utc_datetime(
+            &NaiveDateTime::from_timestamp_opt(first_commit.time().seconds(), 0)
+                .ok_or(anyhow::Error::msg("lo"))?,
+        )
+        .year();
+
+    let latest_year = Utc
+        .from_utc_datetime(
+            &NaiveDateTime::from_timestamp_opt(latest_commit.time().seconds(), 0)
+                .ok_or(anyhow::Error::msg("lo"))?,
+        )
+        .year();
 
     let notice = match first_year.cmp(&latest_year) {
         Ordering::Equal => format!("{}", first_year),