build: require Python 3.11 or later

pydantic-settings and validators, at the versions required, support
Python 3.11 and later only.

- Raise requires-python, drop the 3.10 classifier and move black's
  target to py311.

pyproject.toml

@@ -14,13 +14,12 @@ authors = [
 ]
 license = { text = "MIT" }
 readme = "README.md"
-requires-python = ">=3.10"
+requires-python = ">=3.11"
 classifiers = [
     "Development Status :: 4 - Beta",
     "Environment :: Console",
     "Intended Audience :: Developers",
     "Intended Audience :: Science/Research",
-    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
@@ -53,7 +52,7 @@ mdrs = "mdrsclient.__main__:main"
 
 [tool.black]
 line-length = 120
-target-version = ['py310']
+target-version = ['py311']
 include = '\.pyi?$'
 exclude = '''
 /(