Use library provided erase_if()

`Algorithm::removeIf()` is still valuable as `QHash::removeIf()` predicate require an
iterator or a `std::pair`, which both require more code to unpack the variable and therefore
cumbersome to use.

PR #19353.

src/base/http/server.cpp

@@ -148,7 +148,7 @@ void Server::removeConnection(Connection *connection)
 
 void Server::dropTimedOutConnection()
 {
-    Algorithm::removeIf(m_connections, [](Connection *connection)
+    erase_if(m_connections, [](Connection *connection)
     {
         if (!connection->hasExpired(KEEP_ALIVE_DURATION))
             return false;