Depend on latest plink and spherogram

Author: NathanDunfield

dev/release_tools/release_steps.rst

@@ -82,7 +82,7 @@ Final testing
 On various systems, do::
 
   cd SnapPy/dev/release_tools
-  py27 test_pypi.py -p/-e snappy
+  python3 test_pypi.py -p/-e snappy
 
 including CoCalc (but there's an issue with sys.path in the
 latter).  When testing the stand-alone apps, do "import snappy.test;

setup.py

@@ -552,8 +552,8 @@ def split_version(s : str):
                        'SNAPPY_ALWAYS_BUILD_CYOPENGL is set.')
 
 install_requires = ['FXrays>=1.3',
-                    'plink>=2.4.7a1',
-                    'spherogram>=2.4a2',
+                    'plink>=2.4.7',
+                    'spherogram>=2.4',
                     'snappy_manifolds>=1.4',
                     'low_index>=1.2.1',
                     'tkinter-gl>=1.0',