Bump book/external/Nested-Books from 21c0a70 to a8e57da

Bumps [book/external/Nested-Books](https://github.com/TeachBooks/Nested-Books) from `21c0a70` to `a8e57da`.
- [Commits](21c0a704f4...a8e57da253)

---
updated-dependencies:
- dependency-name: book/external/Nested-Books
  dependency-type: direct:production
...

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This commit is contained in:
dependabot[bot] 2025-02-28 08:08:00 +00:00 • committed by GitHub
parent ace533e925
commit eb538859fb
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@ -1 +1 @@
Subproject commit 21c0a704f4b4a932e204991ddeb051f7487d9ac4
Subproject commit a8e57da25302d47806ad1fe4288950c438562199