ci: pin pytest below 9.2 so the forked tests run again

.github/workflows/ci.yml

@@ -26,7 +26,8 @@ jobs:
       - name: Install package + dev tools
         run: |
           python -m pip install --upgrade pip
-          pip install ruff pytest pytest-forked pytest-timeout
+          # With pytest 9.2.0 every test run under --forked exits with status 3.
+          pip install ruff "pytest<9.2" pytest-forked pytest-timeout
           # [calendar] pulls icalendar/recurring-ical-events so the calendar
           # tests actually run (they hard-require the parser libs).
           pip install .[calendar]

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 All notable changes to this project are documented in this file.
 
+## Unreleased
+
+### Fixed
+- **CI runs the tests again.** The workflow installed the newest pytest, and with pytest 9.2.0 every test run under `--forked` exited with status 3, so all 500 tests failed in every pull request while the code was fine (pytest 9.1.1 had passed them on 2026-10-19). `ci.yml` now installs `pytest<9.2` until pytest-forked works with it (branch `fix/ci-pytest-pin`).
+
 ## [0.1.38] - 2026-10-19
 
 ### Added