downloads: upgrade GCC to 10.2.0

Author: indygreg

pythonbuild/downloads.py

@@ -71,10 +71,10 @@
         "python_tag": "cp38",
     },
     "gcc": {
-        "url": "https://ftp.gnu.org/gnu/gcc/gcc-9.3.0/gcc-9.3.0.tar.xz",
-        "size": 70533868,
-        "sha256": "71e197867611f6054aa1119b13a0c0abac12834765fe2d81f35ac57f84f742d1",
-        "version": "9.3.0",
+        "url": "https://ftp.gnu.org/gnu/gcc/gcc-10.2.0/gcc-10.2.0.tar.xz",
+        "size": 75004144,
+        "sha256": "b8dd4368bb9c7f0b98188317ee0254dd8cc99d1e3a18d0ff146c855fe16c1d8c",
+        "version": "10.2.0",
     },
     "gdbm": {
         "url": "ftp://ftp.gnu.org/gnu/gdbm/gdbm-1.18.1.tar.gz",