MNT: Deprecate python 3.7 and 3.8

`setuptools` has removed some stuff needed to build numpy on old
platforms: numpy/numpy#27405

So the musllinux distributions on 3.8 don't build anymore. I tried
to enforce setuptools<74 for python < 3.9, but it seems pip doesn't
guarantee the order of the dependencies, so `oldest-supported-numpy`
gets installed before setuptools is, failing...

For simplicity I'm removing support for these versions

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
         architecture: [x86, x64]
         os:
           [
@@ -68,7 +68,7 @@ jobs:
       - name: Build wheels
         uses: pypa/[email protected]
         env:
-          CIBW_SKIP: pp* cp36-*
+          CIBW_SKIP: pp* cp36-* cp37-* cp38-*
 
       - name: Store wheel artifacts
         uses: actions/upload-artifact@v4

RELEASE.rst

@@ -13,6 +13,7 @@ Bottleneck 1.4.1
 
 Enhancements
 ~~~~~~~~~~~~
+- Deprecate Python 3.7 and 3.8 
 - Add python 3.13 build
 
 Bottleneck 1.4.0

pyproject.toml

@@ -1,12 +1,10 @@
 [build-system]
 requires = [
+    # Setuptools has removed support for msvccompiler
+    # this is needed to build old versions of bottleneck
     "setuptools",
     "versioneer", 
     "wheel",
-    "oldest-supported-numpy ; python_version < '3.9'",
-    # Setuptools has removed support for msvccompiler
-    # this is needed to build old versions of bottleneck
-    "setuptools<74 ; python_version < '3.9'",
     # Comments on numpy build requirement range:
     #
     #   1. >=2.0.x is the numpy requirement for wheel builds for distribution
@@ -17,5 +15,5 @@ requires = [
     #      and disabling build isolation.
     #   3. The <2.3 upper bound is for matching the numpy deprecation policy,
     #      it should not be loosened
-    "numpy>=2.0.0rc1,<2.3 ; python_version >= '3.9'",
+    "numpy>=2,<2.3"
 ]