pylint: run serial so CI on Python 3.15 stops crashing in dill

setup-python "3.x" moved to CPython 3.15.1, which removed code.co_lnotab.
With jobs != 1 pylint pickles the linter for its workers via dill.dumps(),
and dill 0.4.1 (newest release) still reads co_lnotab, so both pylint hooks
died with AttributeError before linting a file. The 3.15 fix is on dill
master only. jobs = 1 in pyproject.toml (the hooks drop their --jobs=4 and
take it from there) avoids dill entirely and keeps CI on the newest Python.
Hook rev bumped v4.0.8 -> v4.1.3 to match requirements.txt.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.pre-commit-config.yaml

@@ -106,7 +106,10 @@ repos:
           - types-requests>=2.31.0
 
   - repo: https://github.com/pylint-dev/pylint
-    rev: v4.0.8
+    # Same release as requirements.txt. No --jobs here: pyproject.toml holds
+    # it at 1, because parallel pylint pickles through dill, which crashes on
+    # Python 3.15 (see the comment on `jobs` there).
+    rev: v4.1.3
     hooks:
       # Two hooks, because the three checks below are not defects in a test
       # suite -- they are how pytest and unit-testing private mixins work --
@@ -127,7 +130,6 @@ repos:
         args:
           - --rcfile=pyproject.toml
           - --fail-under=8.0
-          - --jobs=4
         additional_dependencies:
           - pytest
           # Kept in step with pyproject.toml: pip refuses two different
@@ -148,7 +150,6 @@ repos:
         args:
           - --rcfile=pyproject.toml
           - --fail-under=8.0
-          - --jobs=4
           - --disable=protected-access,unused-argument,duplicate-code
         additional_dependencies:
           - pytest

pyproject.toml

@@ -180,7 +180,12 @@ exclude = [".venv/"]
 init-hook = "import sys; sys.path.insert(0, '.')"
 analyse-fallback-blocks = true
 persistent = true
-jobs = 0
+# Serial on purpose. With jobs != 1 pylint ships the linter to its workers via
+# dill.dumps(), and dill 0.4.1 (newest release) reads code.co_lnotab, which
+# CPython 3.15 removed -- every run crashed once setup-python's "3.x" became
+# 3.15.1. The fix sits on dill master, unreleased; return to 0 once a dill
+# release past 0.4.1 ships. The pre-commit hooks take this value too.
+jobs = 1
 py-version = "3.14"
 ignore = [".venv", "__pycache__"]
 # Test suites intentionally use patterns (protected-access, fixture-arg