Bump pypdf from 5.0.0 to 6.6.0 in /embedchain

Bumps [pypdf](https://github.com/py-pdf/pypdf) from 5.0.0 to 6.6.0.
- [Release notes](https://github.com/py-pdf/pypdf/releases)
- [Changelog](https://github.com/py-pdf/pypdf/blob/main/CHANGELOG.md)
- [Commits](py-pdf/pypdf@5.0.0...6.6.0)

---
updated-dependencies:
- dependency-name: pypdf
  dependency-version: 6.6.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

embedchain/poetry.lock

@@ -102,7 +102,7 @@ chromadb = "^0.5.10"
 posthog = "^3.0.2"
 rich = "^13.7.0"
 beautifulsoup4 = "^4.12.2"
-pypdf = "^5.0.0"
+pypdf = ">=5,<7"
 gptcache = "^0.1.43"
 pysbd = "^0.3.4"
 mem0ai = "^0.1.54"