Merge ~nick-moffitt/squid-reverseproxy-charm:squid4 into squid-reverseproxy-charm:master

[Nick Moffitt]

We only support HTTPS on focal and later.

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

This merge proposal is being monitored by mergebot. Change the status to Approved to merge.

[Colin Watson (cjwatson)]

If https://code.launchpad.net/~cjwatson/squid-reverseproxy-charm/+git/squid-reverseproxy-charm/+merge/447458 lands before this, then please update this branch to adjust the `run-on` section as well.

[Haw Loeung (hloeung)]

LGTM

review: Approve (+1)

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

Change successfully merged at revision d6998b158ceb2dc554e602f03cd58f4c5b45a0b5

[Haw Loeung (hloeung)]

https://code.launchpad.net/~hloeung/squid-reverseproxy-charm/+git/squid-reverseproxy-charm/+merge/455013 updates the `run-on` section to match.

diff --git a/metadata.yaml b/metadata.yaml
index 09d34cf..c0d7d03 100644
--- a/metadata.yaml
+++ b/metadata.yaml
@@ -18,10 +18,8 @@ description: >
 tags:
     - cache-proxy
 series:
-    - bionic
+    - jammy
     - focal
-    - xenial
-    - trusty
 provides:
   cached-website:
     interface: http