Update declared Python support to match what we are testing (#1615)

* Update declared Python support to match what we are testing

* changelog

news/1606.bugfix

@@ -1,7 +1,6 @@
 Fix a bunch of deprecation warnings in a Plone 5.2 compatible way.
-Applied propert isort.
+Applied proper isort.
 Fixed unclosed file issues in a test.
 Added Python 3.11 to test matrix.
 [jensens]
 
-

news/1615.bugfix

@@ -0,0 +1 @@
+No longer declare support for Python 3.6 (it was already not tested). @davisagli

setup.py

@@ -10,7 +10,7 @@
     3,
     6,
     0,
-), "plone.restapi 8 requires Python 3.6.0+. Please downgrade to plone.restapi 7 for Python 2 and Plone 4.3/5.1."
+), "plone.restapi 8 requires Python 3.7.0+. Please downgrade to plone.restapi 7 for Python 2 and Plone 4.3/5.1."
 
 
 def read(filename):
@@ -68,10 +68,11 @@ def read(filename):
         "Intended Audience :: Developers",
         "Operating System :: OS Independent",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3 :: Only",
         "Topic :: Software Development :: Libraries :: Python Modules",
     ],
@@ -83,7 +84,7 @@ def read(filename):
     packages=find_packages("src"),
     package_dir={"": "src"},
     namespace_packages=["plone"],
-    python_requires=">=3.6.0",
+    python_requires=">=3.7.0",
     include_package_data=True,
     zip_safe=False,
     install_requires=[