Increased buffer again as the smaller buffer broke client certificates

src/SSLClientImpl.h

@@ -202,7 +202,7 @@ private:
      * As a rule of thumb SSLClient will fail if it does not have at least 8000 bytes when starting a
      * connection.
      */
-    unsigned char m_iobuf[1536];
+    unsigned char m_iobuf[2048];
     static_assert(sizeof m_iobuf <= BR_SSL_BUFSIZE_BIDI, "m_iobuf must be below maximum buffer size");
     // store the index of where we are writing in the buffer
     // so we can send our records all at once to prevent