[202012][submodule]: Advance sonic-swss & sonic-sairedis

[nazariig]

Signed-off-by: Nazarii Hnydyn nazariig@nvidia.com

Why I did it

• To pick up missing sonic-sairedis changes

How I did it

• N/A

How to verify it

1. make configure PLATFORM=mellanox
2. make target/sonic-mellanox.bin

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106

Description for the changelog

sonic-sairedis:

Commits on Jul 14, 2021
[recorder] Fix incorrect attribute enum value capability query (#843) d86b051

Commits on Jul 16, 2021
[syncd] Fix fdb flood queue size limit check (#863) 3a2af76

Commits on Jul 30, 2021
[vslib] implement query for SAI_DEBUG_COUNTER_TYPE enum values (#842) 575dcb4 

sonic-swss:

 Commits on Jul 20, 2021
[202012][portsorch] fix errors when moving port from one lag to anoth… a67d8af
[debugcounterorch] check if counter type is supported before querying… ( 04105a4

Commits on Jul 27, 2021
Td2: Reclaim buffer from unused ports (#1830) ac7f5cf

Commits on Jul 29, 2021
[Dynamic Buffer Calc][202012]Bug fix: Don't create lossless buffer pr… f54b7d0 

A picture of a cute animal (not mandatory but encouraged)

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[nazariig]

/azpw run

[mssonicbld]

/AzurePipelines run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[nazariig]

@prsunny please help to merge