PMM-7 add v3 branch to dependabot

[BupycHuk]

PMM-7

Link to the Feature Build: SUBMODULES-0

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[ademidoff]

Would directory: "/build/docker" work to reduce the number of lines?

[ademidoff]

Should this be the .github directory to be more specific?

[ademidoff]

Frankly, I think we should postpone this PR and focus on paying attention to upgrades coming from the main branch until we release v3 and then make it main. The reason is simple: whatever we upgrade in main propagates to v3 automatically.

I'm just afraid this will double the effort before it's necessary.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.05%. Comparing base (c07b97b) to head (1ac1e85).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2960   +/-   ##
=======================================
  Coverage   42.04%   42.05%           
=======================================
  Files         399      399           
  Lines       50719    50719           
=======================================
+ Hits        21325    21330    +5     
+ Misses      27385    27381    -4     
+ Partials     2009     2008    -1     

Flag	Coverage Δ
admin	11.59% <ø> (ø)
agent	51.85% <ø> (+0.04%)	⬆️
managed	42.80% <ø> (ø)
vmproxy	68.57% <ø> (ø)

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