bump actions/checkout from 5 to 6 in erb template

Author: minimum2scp

.github/workflows/check-update.yml.erb

@@ -15,7 +15,7 @@ jobs:
     needs: <%= image.sub(/^baseimage/, 'debian') %>
     <%- end -%>
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # setup ruby
       - uses: ruby/setup-ruby@v1

.github/workflows/ci.yml.erb

@@ -62,10 +62,10 @@ images = {
       <%- end -%>
       <%- if image_conf[:build_image] -%>
       # build image
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: docker build -t minimum2scp/<%= image %>:latest <%= image %>
       <%- else -%>
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       <%- end -%>
 
       # setup ruby