ci(deps): update pandas requirement from <3,>=2.0 to >=3.0.5,<4 (#65)

Updates the requirements on [pandas](https://github.com/pandas-dev/pandas) to permit the latest version.
- [Release notes](https://github.com/pandas-dev/pandas/releases)
- [Commits](pandas-dev/pandas@v2.0.0...v3.0.5)

---
updated-dependencies:
- dependency-name: pandas
  dependency-version: 3.0.5
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -9,7 +9,7 @@
 # 69-Paper-WorkFlow demo gate as of v2026.07. Upper bounds leave room
 # for upstream API changes and are not strict pins.
 numpy>=1.26,<3
-pandas>=2.0,<3
+pandas>=3.0.5,<4
 matplotlib>=3.11.1,<4
 statsmodels>=0.14,<1
 linearmodels>=4.27,<6