[3.8] closes bpo-39630: Update pointers to string literals to be const char *. (GH-18511)

(cherry picked from commit 7386a70746cf9aaf2d95db75d9201fb124f085df)

Co-authored-by: Andy Lester <andy@petdance.com>
diff --git a/Python/codecs.c b/Python/codecs.c
index d4b34f8..4bd28ec 100644
--- a/Python/codecs.c
+++ b/Python/codecs.c
@@ -1415,7 +1415,7 @@
 static int _PyCodecRegistry_Init(void)
 {
     static struct {
-        char *name;
+        const char *name;
         PyMethodDef def;
     } methods[] =
     {