Fix verify-codegen.sh to ignore Copyright lines

Signed-off-by: Maartje Eyskens <maartje@eyskens.me>

hack/verify-codegen.sh

@@ -53,7 +53,9 @@ tmpfiles=$TEST_TMPDIR/files
   rm -rf {.,"$tmpfiles"}/{"$gazelle","$kazel"}
 )
 # Avoid diff -N so we handle empty files correctly
+# Ignoring Copyright to not trigger a CI fail avery new year
 diff=$(diff -upr \
+  -I '^Copyright.*' \
   "./pkg" "$tmpfiles/pkg" 2>/dev/null || true)
 
 if [[ -n "${diff}" ]]; then