feat(pack)!: change `src` of installed plugin inside `update()` in place

Problem: Changing `src` of already installed plugin currently takes
  effect immediately inside `vim.pack.add()` and acts as "delete and
  later fresh install". Although more robust, this might lead to
  unintentional data loss (since plugin is deleted) if the plugin was
  manually modified or the new source is not valid.
  Also this introduces unnecessary differentiation between "change
  `version`" and "change `src`" of already installed plugin.

Solution: Require an explicit `vim.pack.update()` to change plugin's
  source. It is done by conditionally changing `origin` remote of the
  Git repo. The effect does not require update confirmation in order to
  have new changes fetched from the new `src` right away.

  If in the future there are more types of plugins supported (i.e. not
  only Git repos), also do extra work (like delete + install) during
  `vim.pack.update()`.

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