fix(types): fix some type annotations

[plsplsplslol]

Description

The version type should be string|false like in the documentation https://lazy.folke.io/spec#spec-versioning
This fixes a type error in manage/git.lua

  if version then
    local last = Semver.last(M.get_versions(plugin.dir, version)) -- version should only be a string here

ProcessOpts args should be optional, since the nil case is already handled in Process.new in manage/process.lua
This fixes a few places in manage/git.lua where args is not supplied

function M.count(repo, commit1, commit2)
  local lines = Process.exec({ "git", "rev-list", "--count", commit1 .. ".." .. commit2 }, { cwd = repo }) -- warning: args field missing
  return tonumber(lines[1] or "0") or 0
end

function M.age(repo, commit)
  local lines = Process.exec({ "git", "show", "-s", "--format=%cr", "--date=short", commit }, { cwd = repo }) -- warning: args field missing
  return lines[1] or ""
end

Related Issue(s)

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