[submodule] Advance sonic-py-swsssdk pointer (#12559)

Update sonic-py-swsssdk submodule pointer to include the following:

7f008a1 Fix UT test_BlockUseSwsssdk() (#128)
e30a1e1 Throw exception when not use swsssdk in UT. (#126)

Signed-off-by: dprital <drorp@nvidia.com>