downloads: upgrade CPython 3.7 to 3.7.9

Author: indygreg

pythonbuild/downloads.py

@@ -53,10 +53,10 @@
         "version": "3.15.1",
     },
     "cpython-3.7": {
-        "url": "https://www.python.org/ftp/python/3.7.7/Python-3.7.7.tar.xz",
-        "size": 17268888,
-        "sha256": "06a0a9f1bf0d8cd1e4121194d666c4e28ddae4dd54346de6c343206599f02136",
-        "version": "3.7.7",
+        "url": "https://www.python.org/ftp/python/3.7.9/Python-3.7.9.tar.xz",
+        "size": 17389636,
+        "sha256": "91923007b05005b5f9bd46f3b9172248aea5abc1543e8a636d59e629c3331b01",
+        "version": "3.7.9",
         "licenses": ["Python-2.0", "CNRI-Python"],
         "license_file": "LICENSE.cpython.txt",
         "python_tag": "cp37",