Update minimum python version to 3.8

All older versions are EOL and none of the distributions we support
should have such an old version.

Author: arichardson

pycheribuild/utils.py

@@ -80,8 +80,8 @@
     "warning_message",
 ]
 
-if sys.version_info < (3, 6, 0):
-    sys.exit("This script requires at least Python 3.6.0")
+if sys.version_info < (3, 8, 0):  # noqa: UP036
+    sys.exit("This script requires at least Python 3.8.0")
 
 Type_T = typing.TypeVar("Type_T")
 

pyproject.toml

@@ -1,7 +1,6 @@
 [tool.ruff]
 # Ensure suggested fixes are compatible with our minimum supported version
-# XXX: Currently this is py36, but the minimum supported by ruff is py37.
-target-version = "py37"
+target-version = "py38"
 line-length = 120
 src = ["pycheribuild", "release-scripts", "test-scripts", "tests"]
 exclude = [
@@ -20,7 +19,6 @@ show-fixes = true
 select = ["E", "F", "I", "N", "W", "U", "COM", "RUF", "PLC", "PLE", "PLW"]
 ignore = [
     "UP037",  # Remove quotes from type annotation, not possible until we start using 3.7 as the minimum
-    "UP036", # 'Version block is outdated for minimum Python version' to be removed when we set the minimum to 3.8
     "PLW2901", # `for` loop variable `value` overwritten by assignment target
     "RUF012",  # Mutable class attributes should be annotated with `typing.ClassVar` (cannot be fixed due to bug)
     "COM812",  # Incompatible with `ruff format`
@@ -33,7 +31,7 @@ known-local-folder = ["pycheribuild"]
 
 [tool.black]
 line-length = 120
-target-version = ['py36']
+target-version = ['py38']
 # 'extend-exclude' excludes files or directories in addition to the defaults
 # Currently reformatting pycheribuild/ results in lots of weird formatting, so
 # let's restrict this to the other files for now.