Cherry-pick Python 3.14 support and free-threading from upstream (#8)

* Fix crash when TypedDict contains incorrect metadata (jcrist#853)

* Fix annotations support on 3.14 (jcrist#852)

* Relax all getrefcount tests to allow lower numbers (jcrist#854)

* Add 3.14 to CI (jcrist#888)

* add free-threading support  (jcrist#877)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

* Enable Python 3.14 tests in CI

Remove cp314-* from CIBW_TEST_SKIP to allow Python 3.14 tests to run.
Previously, 3.14 wheels were built but tests were skipped.

---------

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Miro Hrončok <miro@hroncok.cz>
Co-authored-by: Ofek Lev <ofekmeister@gmail.com>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>

Author: 5 people

.github/workflows/ci.yml

@@ -5,12 +5,13 @@ on:
     branches: [main]
   pull_request:
     branches: [main]
-    paths-ignore:
-      - "docs/**"
-      - "benchmarks/**"
-      - "examples/**"
-      - ".github/**"
-      - "README.rst"
+    paths:
+      - "msgspec/**"
+      - ".github/workflows/ci.yml"
+      - ".pre-commit-config.yaml"
+      - "pyproject.toml"
+      - "setup.py"
+      - "setup.cfg"
   release:
     types: [published]
   workflow_dispatch:
@@ -22,7 +23,7 @@ on:
 
 jobs:
   lint:
-    name: Lint and ruff code
+    name: Run static analysis
     runs-on: ubuntu-latest
 
     steps:
@@ -86,11 +87,11 @@ jobs:
     env:
       CIBW_TEST_EXTRAS: "test"
       CIBW_TEST_COMMAND: "pytest {project}/tests"
-      CIBW_BUILD: "cp39-* cp310-* cp311-* cp312-* cp313-* cp314-*"
+      CIBW_BUILD: "cp39-* cp310-* cp311-* cp312-* cp313-* cp314-* cp314t-*"
       CIBW_SKIP: "*-win32 *_i686 *_s390x *_ppc64le"
       CIBW_ARCHS_MACOS: "x86_64 arm64"
       CIBW_ARCHS_LINUX: "x86_64 aarch64"
-      CIBW_TEST_SKIP: "*_arm64 *-musllinux_* cp314-*"
+      CIBW_TEST_SKIP: "*_arm64 *-musllinux_*"
       CIBW_ENVIRONMENT: "CFLAGS=-g0"
 
     steps:
@@ -107,7 +108,7 @@ jobs:
       - name: Set up Environment
         if: github.event_name != 'release' && github.event_name != 'workflow_dispatch'
         run: |
-            echo "CIBW_SKIP=${CIBW_SKIP} *-musllinux_* cp39-*_aarch64 cp311-*_aarch64 cp312-*_aarch64 cp313-*_aarch64 cp314-*_aarch64" >> $GITHUB_ENV
+            echo "CIBW_SKIP=${CIBW_SKIP} *-musllinux_* cp39-*_aarch64 cp311-*_aarch64 cp312-*_aarch64 cp313-*_aarch64 cp314-*_aarch64 cp314t-*_aarch64" >> $GITHUB_ENV
 
       - name: Build & Test Wheels
         uses: pypa/cibuildwheel@v3.2.1