chore(deps): update alpine docker tag to v3.22 (#45)

| datasource | package | from | to   |
| ---------- | ------- | ---- | ---- |
| docker     | alpine  | 3.20 | 3.22 |

Co-authored-by: dreadnode-renovate-bot[bot] <184170622+dreadnode-renovate-bot[bot]@users.noreply.github.com>

Author: dreadnode-renovate-bot[bot]

src/book/templates/nmap.Dockerfile

@@ -1,7 +1,7 @@
 # credits: https://github.com/instrumentisto/nmap-docker-image/blob/main/Dockerfile
 
 # https://hub.docker.com/_/alpine
-FROM alpine:3.20
+FROM alpine:3.22
 
 ARG nmap_ver=7.95
 ARG build_rev=4