Bump book/external/sphinx-iframes from e21273d to 89f544c

Bumps [book/external/sphinx-iframes](https://github.com/TeachBooks/sphinx-iframes) from `e21273d` to `89f544c`.
- [Release notes](https://github.com/TeachBooks/sphinx-iframes/releases)
- [Commits](e21273da13...89f544c46c)

---
updated-dependencies:
- dependency-name: book/external/sphinx-iframes
  dependency-version: 89f544c46ca36b9e57e3f0b724fcc81667c083bf
  dependency-type: direct:production
...

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This commit is contained in:
dependabot[bot] 2025-07-20 22:51:45 +00:00 • committed by GitHub
parent 626d982c64
commit 7ed9839172
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@ -1 +1 @@
Subproject commit e21273da134cbf4753da5faf9adc277b8f1c3a1c
Subproject commit 89f544c46ca36b9e57e3f0b724fcc81667c083bf