[mgmt-framework]: Update submodule (sonic-net#6829)

Including commits: ``` 58a77fa 2021-02-20 | Git clone go dependencies instead of 'go get' (#79) [Sachin Holla] ```
SONIC-DEV · Feb 20, 2021 · 712f331 · 712f331
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commit 712f331
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diff --git a/src/sonic-mgmt-framework b/src/sonic-mgmt-framework