[submodule] Advance sonic-utilities pointer

Update sonic-utilities submodule pointer to include the following:
* 33e85d3 [dhcp_relay] Remove add field of vlanid to DHCP_RELAY table while add vlan ([sonic-net#2678](sonic-net/sonic-utilities#2678))
* 36824e4 Add support of secure warm-boot ([sonic-net#2532](sonic-net/sonic-utilities#2532))
* 556d0c6 [doc] Add docs for dhcp_relay show/clear cli ([sonic-net#2649](sonic-net/sonic-utilities#2649))
* 2a6a06c [portstat CLI] don't print reminder if use json format ([sonic-net#2670](sonic-net/sonic-utilities#2670))
* ee6d213 [generate_dump] Revert Revert generate_dump optimization PR's 2599, add fixes for empty /dump forder and symbolic links ([sonic-net#2645](sonic-net/sonic-utilities#2645))
* 784a15c [vlan] Refresh dhcpv6_relay config while adding/deleting a vlan ([sonic-net#2660](sonic-net/sonic-utilities#2660))
* 7e94c5f [GCU] protect loopback0 from deletion ([sonic-net#2638](sonic-net/sonic-utilities#2638))

Signed-off-by: dprital <[email protected]>

Author: dprital