rust: fix new clippy issues with MSRV update

rust/src/jsonbuilder.rs

@@ -809,7 +809,7 @@ impl JsonBuilder {
     }
 
     fn encode_base64(&mut self, val: &[u8]) -> Result<&mut Self, JsonError> {
-        let encoded_len = 4 * ((val.len() + 2) / 3);
+        let encoded_len = 4 * val.len().div_ceil(3);
         if self.buf.capacity() < self.buf.len() + encoded_len {
             self.buf.try_reserve(encoded_len)?;
         }

rust/src/krb/log.rs

@@ -61,7 +61,7 @@ fn krb5_log_response(jsb: &mut JsonBuilder, tx: &KRB5Transaction) -> Result<(),
     jsb.set_string("encryption", &encryption)?;
     jsb.set_bool(
         "weak_encryption",
-        tx.etype.map_or(false, test_weak_encryption),
+        tx.etype.is_some_and(test_weak_encryption),
     )?;
     if let Some(x) = tx.ticket_etype {
         let refs = format!("{:?}", x);

rust/src/ldap/ldap.rs

@@ -178,8 +178,7 @@ impl LdapState {
     fn find_request(&mut self, message_id: MessageID) -> Option<&mut LdapTransaction> {
         self.transactions.iter_mut().find(|tx| {
             tx.request
-                .as_ref()
-                .map_or(false, |req| req.message_id == message_id)
+                .as_ref().is_some_and(|req| req.message_id == message_id)
         })
     }