Run py-fuzzer using Python 3.14 in CI (#20957)

.github/workflows/ci.yaml

@@ -22,7 +22,7 @@ env:
   CARGO_TERM_COLOR: always
   RUSTUP_MAX_RETRIES: 10
   PACKAGE_NAME: ruff
-  PYTHON_VERSION: "3.13"
+  PYTHON_VERSION: "3.14"
   NEXTEST_PROFILE: ci
 
 jobs:
@@ -557,7 +557,8 @@ jobs:
           persist-credentials: false
       - uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6.0.0
         with:
-          python-version: ${{ env.PYTHON_VERSION }}
+          # TODO: figure out why `ruff-ecosystem` crashes on Python 3.14
+          python-version: "3.13"
 
       - uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5.0.0
         name: Download comparison Ruff binary
@@ -711,7 +712,7 @@ jobs:
             --baseline-executable="${PWD}/ty" \
             --only-new-bugs \
             --bin=ty \
-            0-500
+            0-1000
           )
 
   cargo-shear:

.github/workflows/daily_fuzz.yaml

@@ -49,7 +49,7 @@ jobs:
           # shellcheck disable=SC2046
           (
             uv run \
-            --python=3.13 \
+            --python=3.14 \
             --project=./python/py-fuzzer \
             --locked \
             fuzz \

python/py-fuzzer/fuzz.py

@@ -66,7 +66,7 @@ def ruff_contains_bug(code: str, *, ruff_executable: Path) -> bool:
             "lint.select=[]",
             "--no-cache",
             "--target-version",
-            "py313",
+            "py314",
             "--preview",
             "-",
         ],