[sonic-sairedis] Update submodule (#7202)

1906fdf [pyext] Update Makefile to disable warning Wconversion for older swig (#817)
1dbcaeb Remove gbsyncd_startup.py (#813)
0372615 [vslib] Refresh queue pause status (#814)
00d883c [sairedis] Add sai_dbg_generate_dump api to redis interface (#811)
8585803 [sairedis] Unlock api mutex for communication mode (#812)
c69549a [pyext] Add SWIG sairedis python submodule (#806)