Update Pi-hole to v5.18 (#341)

Co-authored-by: Steven Briscoe <me@stevenbriscoe.com>

pi-hole/docker-compose.yml

@@ -8,7 +8,7 @@ services:
       PROXY_AUTH_ADD: "false"
   
   server:
-    image: pihole/pihole:2022.11.1@sha256:7ea4b00fcb3e4942b88015ddbb1fe9bbda95b692d8e56f1a13481356a1eb2707
+    image: pihole/pihole:2022.12@sha256:773ed874ca7244b04da6470eb1e596c5c8960afe14fda3162e29ab4d79c3d239
     # Pi-hole doesn't currently support running as non-root
     # https://github.com/pi-hole/docker-pi-hole/issues/685
     # user: "1000:1000"

pi-hole/umbrel-app.yml

@@ -2,7 +2,7 @@ manifestVersion: 1.1
 id: pi-hole
 category: Networking
 name: Pi-hole
-version: "5.14.1-hotfix-1"
+version: "5.18"
 tagline: Block ads on your entire network
 description: >-
   Instead of browser plugins or other software on each computer,
@@ -31,10 +31,16 @@ defaultUsername: ""
 deterministicPassword: true
 torOnly: false
 releaseNotes: >-
-  - Various internal improvements
+  Various internal improvements:
   
-  - What's Changed (FTL 5.19.2)
+  - FTL v5.20
   
-  - Nothing Docker specific this time. This build is to include an FTL hotfix
+  - Fix doughnutTooltip if total percentage of shown slices is less than 0.1%.
+  
+  - Require auth for more API endpoints.
+  
+  - Increase small-box footer contrast ratio.
+  
+  - A fix for the following advisory: GHSA-6qh8-6rrj-7497
 submitter: Umbrel
 submission: https://github.com/getumbrel/umbrel/commit/9ca55a25e043dcd50d5cb92c6ec756d368bb4794