fix(migration): Correctly sort migrations by version number

[nickvergessen]

Summary

Install Talk

Before:

$ occ migration:status spreed
…
    >> Previous Version:                                   8000Date20200407073807
    >> Current Version:                                    8000Date20200407115318
    >> Next Version:                                       10000Date20200819121721
    >> Latest Version:                                     20000Date20240718031959

$ occ migration:status spreed
…
    >> Previous Version:                                   20000Date20240717180417
    >> Current Version:                                    20000Date20240718031959
    >> Next Version:                                       Already at latest migration step
    >> Latest Version:                                     20000Date20240718031959

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• [x] Tests (unit, integration, api and/or acceptance) are included
• [x] Screenshots before/after for front-end changes
• [x] Documentation (manuals or wiki) has been updated or is not required
• [ ] Backports requested where applicable (ex: critical bugfixes)

[nickvergessen]

Should also backport to avoid confusion, but (...) requires 8.1

[AndyScherzinger]

Should also backport to avoid confusion, but (...) requires 8.1

Should than still be (at least) fine for Nc30, no?

[nickvergessen]

/backport to stable30