[submodule]: update sonic-swss-common

* 77d3417 2020-06-22 | [sonic-swss-common] ARMHF warning fixes (sonic-net#352) (HEAD -> master, origin/master, origin/HEAD) [arheneus@marvell.com]
* da8e264 2020-06-21 | [python3]: build python3-swsscommon for python3 support (sonic-net#355) [lguohan]
* 292b08a 2020-06-16 | Changes to support SONiC Gearbox Manager (sonic-net#347) [Syd Logan]
* 58ca4d9 2020-06-10 | Add missed BGP tables into the schema (sonic-net#351) [pavel-shirshov]
* cddfc4e 2020-06-09 | [loglevel] Avoid accessing null ptr in swssloglevel (sonic-net#349) [Stephen Sun]
* 8fce898 2020-06-08 | [schema] update schema with rates and utilization table names (sonic-net#330) [Mykola F]

Signed-off-by: Guohan Lu <lguohan@gmail.com>