collab: Convert collab hosts to CentOS 8

roles/collab/meta/main.yml

@@ -1,4 +1,5 @@
 ---
 dependencies:
   - {role: epel-repo}
+  - {role: foo.sh-repo}
   - {role: apache}

roles/collab/tasks/main.yml

@@ -1,13 +1,21 @@
 ---
+- name: add graphviz repository
+  yum_repository:
+    name: graphviz
+    baseurl: "https://www2.graphviz.org/Packages/stable/centos/$releasever/os/x86_64/"
+    description: Graphviz
+    gpgcheck: false
+    enabled: true
+
 - name: install dependencies
   package:
     name: "{{ item }}"
     state: installed
   with_items:
     - git
-    - graphviz-python
-    - mod_wsgi
+    - graphviz-lang-python2
     - patch
+    - python2-mod_wsgi
     - python2-pip
     - python2-setuptools