Bump wagtail-inventory from 2.5 to 2.6

Bumps [wagtail-inventory](https://github.com/cfpb/wagtail-inventory) from 2.5 to 2.6.
- [Release notes](https://github.com/cfpb/wagtail-inventory/releases)
- [Changelog](https://github.com/cfpb/wagtail-inventory/blob/main/CHANGELOG.md)
- [Commits](cfpb/wagtail-inventory@2.5...2.6)

---
updated-dependencies:
- dependency-name: wagtail-inventory
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -272,7 +272,7 @@ wagtail-factories==4.1.0
     # via -r requirements.in
 wagtail-footnotes @ git+https://github.com/MozillaFoundation/wagtail-footnotes.git@localized-footnotes
     # via -r requirements.in
-wagtail-inventory==2.5
+wagtail-inventory==2.6
     # via -r requirements.in
 wagtail-localize==1.7
     # via