Fixed the build error using gcc 13

Fixed the build error using gcc 13

/home/abuild/rpmbuild/BUILD/capi-mediamuxer-0.1.28/src/port_gst/mediamuxer_port_gst.c: In function '_gst_create_pipeline':
/home/abuild/rpmbuild/BUILD/capi-mediamuxer-0.1.28/src/port_gst/mediamuxer_port_gst.c:1041:91: error: '__builtin___snprintf_chk' output may be truncated before the last format character [-Werror=format-truncation=]
1041 |                                 snprintf(str_appsrc, MAX_STRING_LENGTH, "subtitle_appsrc%d", current->track_index);

Change-Id: I998a798b6abee69c7a204d031baaa88d326180b8