update nginx-ntlm-module version to v1.19.3-beta.1

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: Zoey2936

Dockerfile

@@ -21,7 +21,7 @@ ARG MODSECNGX_VER=v1.0.3
 ARG LRC_VER=v0.1.31
 ARG LRL_VER=v0.15
 ARG NHG2M_VER=3.4
-ARG NNTLM_VER=master
+ARG NNTLM_VER=v1.19.3-beta.1
 
 ARG LIBOQS_VER=0.12.0
 ARG OQSPROVIDER_VER=0.8.0