Use Botan 3.10.0 for tests

Clean up leak-detective whitelist for newer Botan versions but add
`botan_private_key_load` as `botan_privkey_load*` won't show up anymore
without bfd-backtraces due to inlining if we don't call it directly.

Ref: https://github.com/randombit/botan/discussions/4868

scripts/test.sh

@@ -4,7 +4,7 @@
 build_botan()
 {
 	# same revision used in the build recipe of the testing environment
-	BOTAN_REV=3.7.1
+	BOTAN_REV=3.10.0
 	BOTAN_DIR=$DEPS_BUILD_DIR/botan
 
 	if test -d "$BOTAN_DIR"; then