build: require Python 3.10 for the prqlc Python package

CHANGELOG.md

@@ -31,6 +31,14 @@
 
 **Integrations**:
 
+- The `prqlc` Python package now declares `requires-python = ">=3.10"`. Python
+  3.9 reached end-of-life in October 2025 and was never exercised by the test
+  matrix, which runs 3.10 and 3.12. The stale `>=3.9` claim also blocked every
+  Dependabot update to the binding's Python dependencies, because a pinned
+  candidate that itself requires 3.10+ leaves the 3.9 resolution fork
+  unsatisfiable. Users still on 3.9 continue to resolve the last release that
+  declared support for it. (@prql-bot, #6225)
+
 **Internal changes**:
 
 **New Contributors**:

prqlc/bindings/prqlc-python/pyproject.toml

@@ -11,7 +11,7 @@ classifiers = [
 description = "Python bindings for prqlc, the PRQL compiler"
 dynamic = ["version"]
 name = "prqlc"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 
 [tool.maturin]
 # This is required because of https://github.com/PyO3/pyo3/pull/2135 (closed