Update alpine/openssl Docker tag to v3.5.4

Author: renovate[bot]

docker-compose.yml

@@ -1,7 +1,7 @@
 services:
   # Generate RSA key for xtm-composer (PKCS#8 format)
   rsa-key-generator:
-    image: alpine/openssl:3.5.2
+    image: alpine/openssl:3.5.4
     volumes:
       - rsakeys:/keys
     entrypoint: ["/bin/ash"]