Issue #266 - Upgrade Firefox to version 75.0

* Dependency issue

Author: ppodgorsek

Dockerfile

@@ -28,7 +28,7 @@ ENV ALPINE_GLIBC 2.31-r0
 ENV CHROMIUM_VERSION 80.0
 ENV DATABASE_LIBRARY_VERSION 1.2
 ENV FAKER_VERSION 5.0.0
-ENV FFI_VERSION 3.2.1
+ENV FFI_VERSION 3.3
 ENV FIREFOX_VERSION 75.0
 ENV FTP_LIBRARY_VERSION 1.9
 ENV GECKO_DRIVER_VERSION v0.26.0