Update pymupdf requirement from ~=1.26.0 to ~=1.27.1

Updates the requirements on [pymupdf](https://github.com/pymupdf/pymupdf) to permit the latest version.
- [Release notes](https://github.com/pymupdf/pymupdf/releases)
- [Changelog](https://github.com/pymupdf/PyMuPDF/blob/main/changes.txt)
- [Commits](pymupdf/PyMuPDF@1.26.0...1.27.1)

---
updated-dependencies:
- dependency-name: pymupdf
  dependency-version: 1.27.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -12,7 +12,7 @@ dependencies = [
     "promplate-trace[langfuse,langsmith]~=0.3.0.dev5",
     "promplate[openai]~=0.3.4",
     "promptools[tokenizer]~=0.1.3.5",
-    "pymupdf~=1.26.0",
+    "pymupdf~=1.27.1",
     "rich~=14.2.0",
     "ruff~=0.14.0",
     "uvicorn~=0.40.0",