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

Including commits: ``` 58a77fa 2021-02-20 | Git clone go dependencies instead of 'go get' (#79) [Sachin Holla] ```
sonic-net · Feb 20, 2021 · 712f331 · 712f331
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commit 712f331
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/sonic-mgmt-framework b/src/sonic-mgmt-framework