Bump fetcher cache version (backport #11915)

[mergify]

We're getting more reports in

• fetcher cache sqlite error: table Cache has no column named domain #10985

It appears that something hasn't gone right process-wise. I find this mistake not to be worth investigating, but rather something to pay attention to going forward.

Let's nip this in the bud.

Closes #10985

Priorities and Process

Add 👍 to pull requests you find important.

The Nix maintainer team uses a GitHub project board to schedule and track reviews.

---

This is an automatic backport of pull request #11915 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of e948c8e has failed:

On branch mergify/bp/2.24-maintenance/pr-11915
Your branch is up to date with 'origin/2.24-maintenance'.

You are currently cherry-picking commit e948c8e03.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   src/libfetchers/cache.cc

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

Done.