chore(deps): combine and fix up dependabot bumps (black 26, mypy 2, pytest 9)

Combines dependabot PRs #218, #219, #222:
- black 25.* -> 26.* (#218)
- mypy 1.19.* -> 2.1.* (#219)
- pytest 8.4.* -> 9.1.* (#222)

black 26, mypy 2, and pytest 9 all dropped Python 3.9 (require >=3.10).
Pinned via environment markers so the 3.9 CI job installs the last
3.9-compatible versions while 3.10+ gets the upgraded majors. Applied
black 26 reformatting (docstring blank-line rule); verified black 25
agrees with the reformatted tree.

Verified: ruff, black, mypy 2.1.0, and 289 unit tests pass.
Signed-off-by: David Leong <116610336+leongdl@users.noreply.github.com>

Author: leongdl

.github/scripts/get_latest_changelog.py

@@ -29,6 +29,7 @@
 
 ```
 """
+
 import re
 
 h2 = r"^##\s.*$"

hatch_version_hook.py

@@ -7,7 +7,6 @@
 from hatchling.builders.hooks.plugin.interface import BuildHookInterface
 from typing import Any, Optional
 
-
 _logger = logging.Logger(__name__, logging.INFO)
 _stdout_handler = logging.StreamHandler(sys.stdout)
 _stdout_handler.addFilter(lambda record: record.levelno <= logging.INFO)

requirements-testing.txt

@@ -1,9 +1,12 @@
 coverage[toml] == 7.*
-pytest == 8.4.*
+pytest == 9.1.*; python_version >= "3.10"
+pytest == 8.4.*; python_version < "3.10"
 pytest-cov == 7.1.*
 pytest-timeout == 2.4.*
 pytest-xdist == 3.8.*
 types-PyYAML == 6.*
-black == 25.*
-mypy == 1.19.*
+black == 26.*; python_version >= "3.10"
+black == 25.*; python_version < "3.10"
+mypy == 2.1.*; python_version >= "3.10"
+mypy == 1.19.*; python_version < "3.10"
 ruff == 0.15.*

src/openjd/__main__.py

@@ -2,5 +2,4 @@
 
 from .cli._create_argparser import main
 
-
 main()

src/openjd/cli/_create_argparser.py

@@ -14,7 +14,6 @@
 from ._run import populate_argparser as populate_run_subparser
 from ._schema import populate_argparser as populate_schema_subparser
 
-
 # Our CLI subcommand construction requires that all leaf subcommands define a default
 # 'func' property which is a Callable[[],None] that implements the subcommand.
 # After parsing, we call that `func` argument of the resulting args object.

test/openjd/cli/test_run_command.py

@@ -23,7 +23,6 @@
 from openjd.cli._run._local_session._session_manager import LoggingTimestampFormat
 from openjd.sessions import LOG as SessionsLogger, PathMappingRule, PathFormat
 
-
 PARAMETRIZE_CASES: tuple = (
     pytest.param(
         "basic.yaml",