x509-cert: apply clippy Cow<'_, str>

Author: dishmaker

x509-cert/src/ext/pkix/name/dirstr.rs

@@ -90,7 +90,7 @@ impl<'a> der::DecodeValue<'a> for DirectoryString {
 impl DirectoryString {
     /// Returns `Borrowed` variant for UTF-8 compatible strings
     /// and `Owned` variant otherwise.
-    pub fn value<'s>(&'s self) -> Cow<'s, str> {
+    pub fn value(&self) -> Cow<'_, str> {
         match self {
             Self::PrintableString(s) => Cow::Borrowed(s.as_ref()),
             Self::TeletexString(s) => Cow::Borrowed(s.as_ref()),