chore(deps): bump ebooklib from 0.18 to 0.20 in /application

Bumps [ebooklib](https://github.com/aerkalov/ebooklib) from 0.18 to 0.20.
- [Release notes](https://github.com/aerkalov/ebooklib/releases)
- [Changelog](https://github.com/aerkalov/ebooklib/blob/master/CHANGES.txt)
- [Commits](https://github.com/aerkalov/ebooklib/compare/v0.18...v0.20)

---
updated-dependencies:
- dependency-name: ebooklib
  dependency-version: '0.20'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

application/requirements.txt

@@ -6,7 +6,7 @@ cryptography==42.0.8
 dataclasses-json==0.6.7
 docx2txt==0.8
 duckduckgo-search==7.5.2
-ebooklib==0.18
+ebooklib==0.20
 escodegen==1.0.11
 esprima==4.0.1
 esutils==1.0.1