Generate release notes using the new API

https://docs.github.com/en/rest/reference/repos#generate-release-notes-content-for-a-release

script/changelog

@@ -1,24 +0,0 @@
-#!/bin/bash
-set -e
-
-current_tag="${GITHUB_REF#refs/tags/}"
-start_ref="HEAD"
-
-# Find the previous release on the same branch, skipping prereleases if the
-# current tag is a full release
-previous_tag=""
-while [[ -z $previous_tag || ( $previous_tag == *-* && $current_tag != *-* ) ]]; do
-  previous_tag="$(git describe --tags "$start_ref"^ --abbrev=0)"
-  start_ref="$previous_tag"
-done
-
-git log "$previous_tag".. --reverse --first-parent --oneline | \
-  while read -r sha title; do
-    if [[ $title == "Merge pull request #"* ]]; then
-      pr_num="$(grep -o '#[[:digit:]]\+' <<<"$title")"
-      pr_desc="$(git show -s --format=%b "$sha" | sed -n '1,/^$/p' | tr $'\n' ' ')"
-      printf "* %s %s\n\n" "$pr_desc" "$pr_num"
-    else
-      printf "* %s\n\n" "$title"
-    fi
-  done