Describe the bug
distrobox-enter fails if location of distrobox-scripts changed on disk.

To Reproduce
This happened to me with Nix on Ubuntu when updating and the old distrobox version got GC'd from the nix store:

0. Assume a nix-enabled system
1. Get older distrobox: nix-store -r /nix/store/hcn0gjbb8xpl717pdp2bamzjcmspz3rp-distrobox-1.2.15
2. Create a box /nix/store/hcn0gjbb8xpl717pdp2bamzjcmspz3rp-distrobox-1.2.15/bin/distrobox-create --name testbox --image ubuntu:20.04
3. Enter box /nix/store/hcn0gjbb8xpl717pdp2bamzjcmspz3rp-distrobox-1.2.15/bin/distrobox-enter testbox and leave again - works.
4. Stop box /nix/store/hcn0gjbb8xpl717pdp2bamzjcmspz3rp-distrobox-1.2.15/bin/distrobox-stop testbox
5. Remove old distrobox: nix-store --delete /nix/store/hcn0gjbb8xpl717pdp2bamzjcmspz3rp-distrobox-1.2.15
6. Get newer distrobox: nix-store -r /nix/store/7nsxw7jggd33hrcbclgm5v13xds90r8w-distrobox-1.3.0
7. Try to enter box /nix/store/7nsxw7jggd33hrcbclgm5v13xds90r8w-distrobox-1.3.0/bin/distrobox-enter testbox and observe reference to old version in failure message.
8. Get older distrobox again: nix-store -r /nix/store/hcn0gjbb8xpl717pdp2bamzjcmspz3rp-distrobox-1.2.15
9. Try to enter box /nix/store/7nsxw7jggd33hrcbclgm5v13xds90r8w-distrobox-1.3.0/bin/distrobox-enter testbox and observe things work.

Expected behavior
Distrobox should map its own location to a static path inside the container. (Distrobox already has great Nix support!)

Logs
Podman logs do not provide any useful data.

Desktop (please complete the following information):

• Are you using podman or docker? Podman
• Which version or podman or docker? Podman 4.1.0 (/nix/store/76hhw9w196lpwmkyzh4c526ax6sb19gs-podman-wrapper-4.1.0/bin/podman)
• Which version of distrobox? 1.2.15 and 1.3.0, see above