bpo-39943: Add the const qualifier to pointers on non-mutable PyBytes data. (GH-19472)

diff --git a/Modules/_sqlite/connection.c b/Modules/_sqlite/connection.c
index 92bdfe3..91041b9 100644
--- a/Modules/_sqlite/connection.c
+++ b/Modules/_sqlite/connection.c
@@ -79,7 +79,7 @@
         NULL
     };
 
-    char* database;
+    const char* database;
     PyObject* database_obj;
     int detect_types = 0;
     PyObject* isolation_level = NULL;