Release checklist for Surge XT 1.3.0

[baconpaul]

Release label: XT 1.3.0
Link to milestone: https://github.com/surge-synthesizer/surge/milestone/32

Pre Install

• Address all open issues for the milestone
• Update the changelog
• Update the manual
• Make sure the CMakeLists.txt version matches the version you are about to install

Executing the install

• Update the releases-xt/azure-pipelines so we don't get a tag conflict when the release happens even
  if it is just a bump commit
• Create git markers in the surge repo
  • Unlock your GPG key in case, running gpg --output x.sig --sign CMakeLists.txt
  • Create a branch named git checkout -b release-xt/1.3.0
  • Sign a tag with git tag -s release_xt_1.3.0 -m "Create signed tag",
  • Push both the branch and tag to upstream git push --atomic upstream-write release-xt/1.3.0 release_xt_1.3.0

Post Install

• Update and announce
  • Update homebrew doc
  • Update Winget manifest (wingetcreate update --submit --urls https://github.com/surge-synthesizer/releases-xt/releases/download/1.3.0/surge-xt-win64-1.3.0-setup.exe --version 1.3.0 SurgeSynthTeam.SurgeXT)
  • Ping luzpaz in Tracking Surge XT in the downstream package ecosystem #7132
  • Post to KvR thread, Facebook, Discord, etc.