dovecot update to buster only

dovecot/dovecot.sls

-{% if grains['osfinger'] == "Debian-9" %}
-include:
-  - apt.transport.https
-
+{% if grains['osfinger'] == "Debian-10" %}
 dovecot-repo:
   pkgrepo.managed:
     - humanname: dovecot
-    - name: deb https://repo.dovecot.org/ce-2.3-latest/debian/stretch stretch main
+    - name: deb https://repo.dovecot.org/ce-2.3-latest/debian/buster buster main
     - key_url: https://repo.dovecot.org/DOVECOT-REPO-GPG
     - file: /etc/apt/sources.list.d/dovecot.list
     - clean_file: true

dovecot/init.sls

-{% if grains['osfinger'] == "Debian-9" %}
+{% if grains['osfinger'] == "Debian-10" %}
 {%- if 'dovecot' in salt['pillar.get']('roles', []) %}
 include:
   - .dovecot