esp32/sdkconfig: Increase max number of open sockets from 4 to 8.
#define CONFIG_LWIP_THREAD_LOCAL_STORAGE_INDEX 0
#define CONFIG_LWIP_DHCP_MAX_NTP_SERVERS 1
-#define CONFIG_LWIP_MAX_SOCKETS 4
+#define CONFIG_LWIP_MAX_SOCKETS 8
#define CONFIG_MBEDTLS_MPI_INTERRUPT_NUM 18
#define CONFIG_MBEDTLS_HARDWARE_AES 1
