travis-ci: bumped OpenSSL to 1.0.2u.

Author: thibaultcha

.travis.yml

@@ -41,7 +41,7 @@ env:
     - TEST_NGINX_RANDOMIZE=1
     - LUACHECK_VER=0.21.1
   matrix:
-    - NGINX_VERSION=1.17.4 OPENSSL_VER=1.0.2t OPENSSL_PATCH_VER=1.0.2h
+    - NGINX_VERSION=1.17.4 OPENSSL_VER=1.0.2u OPENSSL_PATCH_VER=1.0.2h
     - NGINX_VERSION=1.17.4 OPENSSL_VER=1.1.0l OPENSSL_PATCH_VER=1.1.0d
     - NGINX_VERSION=1.17.4 OPENSSL_VER=1.1.1d OPENSSL_PATCH_VER=1.1.1c