chore: upgrade dependencies

- pandas 2.3 -> 3.0 (constraint now >=3.0.3,<4.0.0)
- dev tools: ruff 0.9 -> 0.15, pytest 8 -> 9
- refresh numpy (2.4.6) and matplotlib (3.10.9) within existing constraints

ruff clean and all 79 tests pass on the new versions.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: arapov

pyproject.toml

@@ -8,7 +8,7 @@ license-files = ["LICENSE"]
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
-    "pandas (>=2.2.3,<3.0.0)",
+    "pandas (>=3.0.3,<4.0.0)",
     "matplotlib (>=3.10.0,<4.0.0)",
     "numpy (>=2.2.1,<3.0.0)",
 ]
@@ -35,8 +35,8 @@ include = [
 ]
 
 [tool.poetry.group.dev.dependencies]
-ruff = "^0.9.5"
-pytest = "^8.3.4"
+ruff = "^0.15.15"
+pytest = "^9.0.3"
 
 [tool.ruff]
 line-length = 120