pkg/docker: set branch 5.8 and refresh [skip ci]

.gitmodules

@@ -1,6 +1,7 @@
 [submodule "pkg/docker"]
 	path = pkg/docker
 	url = https://github.com/kamailio/kamailio-ci.git
+	branch = 5.8
 [submodule "src/modules/tls_wolfssl/lib/wolfssl"]
 	path = misc/external/wolfssl/wolfssl
 	url = https://github.com/wolfSSL/wolfssl.git

pkg/docker

@@ -1 +1 @@
-Subproject commit cf48a82c5f9df67813d14e6619cc9a41ec9a683b
+Subproject commit 969a5dd0d65dadce47049dc5e0dd145e9aff47b8