vote-interface: explicitly use v3 everywhere

[buffalojoec]

Problem

After anza-xyz/solana-sdk#221, the solana-vote-interface crate now explicitly names vote_state_v3::VoteState to vote_state_v3::VoteStateV3. In preparation for the upcoming vote state v4, we should go through the monorepo and update all callsites to use VoteStateV3 explicitly.

Summary of Changes

Update all callsites to use VoteStateV3 explicitly.

[mergify]

The Firedancer team maintains a line-for-line reimplementation of the
native programs, and until native programs are moved to BPF, those
implementations must exactly match their Agave counterparts.
If this PR represents a change to a native program implementation (not
tests), please include a reviewer from the Firedancer team. And please
keep refactors to a minimum.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.30435% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.2%. Comparing base (6bc9fb1) to head (bd49e86).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #6987     +/-   ##
=========================================
- Coverage    83.2%    83.2%   -0.1%     
=========================================
  Files         856      856             
  Lines      376426   376429      +3     
=========================================
- Hits       313321   313280     -41     
- Misses      63105    63149     +44     

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[jstarry]

look great!