Update docs for Python 3.9 drop

README.asciidoc

@@ -84,7 +84,7 @@ Requirements
 
 The following software and libraries are required to run qutebrowser:
 
-* https://www.python.org/[Python] 3.9 or newer
+* https://www.python.org/[Python] 3.10 or newer
 * https://www.qt.io/[Qt], either 6.2.0 or newer, or 5.15.0 or newer, with the following modules:
   - QtCore / qtbase
   - QtQuick (part of qtbase or qtdeclarative in some distributions)

doc/changelog.asciidoc

@@ -27,6 +27,12 @@ Fixed
   accessibility on Qt versions with known issues. This works around a bug in Qt
   6.10.1 causing frequent segfaults (#8797).
 
+Removed
+~~~~~~
+
+- Support for Python 3.9 is dropped, and Python 3.10 is now required.
+
+
 [[v3.6.2]]
 v3.6.2 (2025-11-27)
 -------------------

doc/install.asciidoc

@@ -444,7 +444,7 @@ This installs all needed Python dependencies in a `.venv` subfolder
 This comes with an up-to-date Qt/PyQt including a pre-compiled QtWebEngine
 binary, but has a few caveats:
 
-- Make sure your `python3` is Python 3.9 or newer, otherwise you'll get a "No
+- Make sure your `python3` is Python 3.10 or newer, otherwise you'll get a "No
   matching distribution found" error and/or qutebrowser will not run.
 - It only works on 64-bit x86 systems, with other architectures you'll get the
   same error.