Fixes changelog script (#2435)

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## About The Pull Request

See title

## Why It's Good For The Game

seeing changelogs is good

## Changelog

:cl:
fix: Changelog generation
/:cl:

<!-- Both :cl:'s are required for the changelog to work! You can put
your name to the right of the first :cl: if you want to overwrite your
GitHub username as author ingame. -->
<!-- You can use multiple of the same prefix (they're only used for the
icon ingame) and delete the unneeded ones. Despite some of the tags,
changelogs should generally represent how a player might be affected by
the changes rather than a summary of the PR's contents. -->

tools/changelog/generate_cl.py

@@ -27,7 +27,7 @@
 from pathlib import Path
 
 from github import Github, InputGitAuthor
-from ruamel import yaml
+from ruamel import YAML
 
 CL_BODY = re.compile(r":cl:(.+)?\r\n((.|\n|\r)+?)\r\n\/:cl:", re.MULTILINE)
 CL_SPLIT = re.compile(r"(^\w+):\s+(\w.+)", re.MULTILINE)
@@ -71,6 +71,8 @@
 
 write_cl["delete-after"] = True
 
+yaml = YAML(typ='safe', pure=True)
+
 with open(Path.cwd().joinpath("tools/changelog/tags.yml")) as file:
     tags = yaml.safe_load(file)