Update sha256 value for v2.0.0 universal dmg

[rzv-me]

Overview

Short summary of what this PR does

• Updated: Casks/termix.rb => sha256 value for v2.0.0 universal dmg

Changes Made

I updated Casks/termix.rb to have the correct sha256 value
The issue was:

Error: termix-ssh/termix/termix: SHA-256 mismatch
Expected: a752ad4f05b4991b8a2ef986da80a86b79a70c93fe1045c4399fcf348a28c1d0
  Actual: 2e381ac504093bfa72d16ee20043640724394729b2ca0e6b26c9eac19aeb6d08
    File: /Users/username/Library/Caches/Homebrew/downloads/a404f5d1611440a31839258ec60c77e40aad556e729780863a431ef80b0af043--termix_macos_universal_dmg.dmg

Checklist

• Code follows project style guidelines
• Supports mobile and desktop UI/app (if applicable)
• I have read Contributing.md
• This is not a translation request. See docs