fix: relax lower bound for pdfminer.six (#4262)

The current lower bound for pdfminer.six is still too new for some
commonly used file parsing tools like `pdfplumber`. This PR lowers this
bound so that `unstructured` is compatible with those tools.

Author: badGarnet

CHANGELOG.md

@@ -1,4 +1,11 @@
+## 0.21.5
+
+### Fixes
+- Lower the requirement for `pdfminer.six` to `>=20251230`
+
 ## 0.21.4
+
+### Enhancements
 - Add a github action for testing time regressions
 
 ## 0.21.3

pyproject.toml

@@ -64,7 +64,7 @@ epub = [
 image = [
     "google-cloud-vision>=3.12.1, <4.0.0",
     "pdf2image>=1.17.0, <2.0.0",
-    "pdfminer.six>=20260107, <20270000",
+    "pdfminer.six>=20251230, <20270000",
     "pi-heif>=1.2.0, <2.0.0",
     "pikepdf>=10.3.0, <11.0.0",
     "pypdf>=6.6.2, <7.0.0",

unstructured/__version__.py

@@ -1 +1 @@
-__version__ = "0.21.4"  # pragma: no cover
+__version__ = "0.21.5"  # pragma: no cover