.github: Add more packages to automation

Seems like I forgot to do it when I added them to portage-stable.

Signed-off-by: Krzesimir Nowak <knowak@microsoft.com>

.github/workflows/portage-stable-packages-list

@@ -183,6 +183,7 @@ app-text/docbook-xsl-ns-stylesheets
 app-text/docbook-xsl-stylesheets
 app-text/mandoc
 app-text/manpager
+app-text/scdoc
 app-text/sgml-common
 app-text/xmlto
 
@@ -294,7 +295,9 @@ dev-libs/userspace-rcu
 dev-libs/xmlsec
 dev-libs/yajl
 
+dev-perl/File-Slurper
 dev-perl/Parse-Yapp
+dev-perl/PerlIO-utf8_strict
 
 dev-python/backports-tarfile
 dev-python/cachecontrol
@@ -736,8 +739,11 @@ virtual/openssh
 virtual/os-headers
 virtual/package-manager
 virtual/pager
+virtual/perl-Carp
 virtual/perl-Encode
+virtual/perl-Exporter
 virtual/perl-ExtUtils-MakeMaker
+virtual/perl-XSLoader
 virtual/pkgconfig
 virtual/resolvconf
 virtual/service-manager