refactor: fix clippy::needless_lifetimes warnings

src/blob.rs

@@ -622,7 +622,7 @@ fn exif_orientation(exif: &exif::Exif, context: &Context) -> i32 {
     0
 }
 
-impl<'a> fmt::Display for BlobObject<'a> {
+impl fmt::Display for BlobObject<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "$BLOBDIR/{}", self.name)
     }

src/pgp.rs

@@ -41,7 +41,7 @@ enum SignedPublicKeyOrSubkey<'a> {
     Subkey(&'a SignedPublicSubKey),
 }
 
-impl<'a> KeyTrait for SignedPublicKeyOrSubkey<'a> {
+impl KeyTrait for SignedPublicKeyOrSubkey<'_> {
     fn fingerprint(&self) -> Vec<u8> {
         match self {
             Self::Key(k) => k.fingerprint(),
@@ -64,7 +64,7 @@ impl<'a> KeyTrait for SignedPublicKeyOrSubkey<'a> {
     }
 }
 
-impl<'a> PublicKeyTrait for SignedPublicKeyOrSubkey<'a> {
+impl PublicKeyTrait for SignedPublicKeyOrSubkey<'_> {
     fn verify_signature(
         &self,
         hash: HashAlgorithm,