samples: net: sockets: http_get: Increase MBEDTLS_SSL_MAX_CONTENT_LEN
samples: net: sockets: http_get: Increase MBEDTLS_SSL_MAX_CONTENT_LEN

The Google server that the sample connects to sends a larger certificate
since recently. As the overall size of the message conveying the
ceritificate is ~4700 bytes now, current mbedTLS configuration did not
allow to reassemble the message and thus caused failure during the
handshake.

Fix this by increasing MBEDTLS_SSL_MAX_CONTENT_LEN parameter (with some
extra space for any future changes).

Signed-off-by: Robert Lubos <9d28997c6894a2d0321a7bb399169af7ce99b64e@nordicsemi.no>

zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr