travis: install missing deps for the Coverity run

Let's install libzstd & libfido2 to cover two recently added features.
In case of libfido2 this should also get rid of the 'dead code' issues
found by Coverity, like CID#1430168, CID#1430167, CID#1430166, or
CID#1430165.

travis-ci/managers/fedora.sh

@@ -18,11 +18,15 @@ REPO_ROOT="${REPO_ROOT:-$PWD}"
 ADDITIONAL_DEPS=(
     clang
     dnf-plugins-core
-    hostname libasan
-    jq iputils
+    hostname
+    iputils
+    jq
+    libasan
     libfdisk-devel
+    libfido2-devel
     libpwquality-devel
     libubsan
+    libzstd-devel
     llvm
     openssl-devel
     p11-kit-devel