Don't test against multiple WP patch versions

Currently we test against WordPress 6.8.2, 6.8.1,
6.8.0, etc. for every WP version we have
available. This takes too long already, and the
problem gets worse with each WP release.

Use awk to filter out the 6.8.1, 6.8.0, etc. so
that we always test against the latest patch
for each WP major.minor version.

Author: john-shaffer

bin/update-json

@@ -10,7 +10,8 @@ echo "Getting wordpress_* packages from $FLAKE_REF for system $SYSTEM..."
 wordpress_packages=$(nix eval --json --impure \
   --expr "builtins.attrNames (builtins.getFlake \"$FLAKE_REF\").packages.\"$SYSTEM\"" \
   | jq -r '.[]' | grep '^wordpress_' \
-  | sort -t_ -k2,2nr -k3,3nr -k4,4nr)
+  | sort -t_ -k2,2nr -k3,3nr -k4,4nr\
+  | awk -F_ '!seen[$2"_"$3]++')
 
 if [[ -z "$wordpress_packages" ]]; then
   echo "No wordpress_* packages found."