Remove clippy allow attributes that are no longer needed

Author: jtgeibel

src/email.rs

@@ -43,7 +43,6 @@ fn build_email(
         .map(|s| s.smtp_login.as_str())
         .unwrap_or("test@localhost");
 
-    #[allow(clippy::redundant_closure)]
     let email = Email::builder()
         .to(recipient)
         .from(sender)

src/models/version.rs

@@ -129,7 +129,6 @@ impl Version {
 }
 
 impl NewVersion {
-    #[allow(clippy::new_ret_no_self)]
     pub fn new(
         crate_id: i32,
         num: &semver::Version,

src/tests/krate.rs

@@ -1505,7 +1505,6 @@ fn yank_by_a_non_owner_fails() {
 }
 
 #[test]
-#[allow(clippy::cognitive_complexity)]
 fn yank_max_version() {
     let (_, anon, _, token) = TestApp::full().with_token();