dropbear: bump to 2024.85

- update dropbear to latest stable 2024.85;
  for the changes see https://matt.ucc.asn.au/dropbear/CHANGES
- drop cherry-picked patches (merged in release 2024.84)
- refresh remaining patches

Tested-by: Stijn Segers <foss@volatilesystems.org>
Signed-off-by: Konstantin Demin <rockdrilla@gmail.com>

package/network/services/dropbear/patches/140-disable_assert.patch

@@ -1,5 +1,5 @@
---- a/dbutil.h
-+++ b/dbutil.h
+--- a/src/dbutil.h
++++ b/src/dbutil.h
 @@ -80,7 +80,11 @@ int m_snprintf(char *str, size_t size, c
  #define DEF_MP_INT(X) mp_int X = {0, 0, 0, NULL}