Use wolfSSL 5.6.2 for tests

ECC keys can now be smaller so we can't access the private key directly
anymore.

scripts/test.sh

@@ -37,7 +37,7 @@ build_botan()
 
 build_wolfssl()
 {
-	WOLFSSL_REV=v5.6.0-stable
+	WOLFSSL_REV=v5.6.2-stable
 	WOLFSSL_DIR=$DEPS_BUILD_DIR/wolfssl
 
 	if test -d "$WOLFSSL_DIR"; then