Allow 429 errors during link checks

Awesomebot can trigger 429, even though it's configured to wait a second
between requests. 429s eventually go away, keep them from blocking PRs.

Signed-off-by: Joe Block <jpb@unixorn.net>

.github/workflows/awesomebot.yml

@@ -15,4 +15,4 @@ jobs:
     - uses: actions/checkout@v3
     - uses: docker://dkhamsing/awesome_bot:latest
       with:
-        args: /github/workspace/README.md --allow-timeout --allow 500,501,502,503,504,509,521 --allow-dupe --allow-ssl --request-delay 1 --allow-redirect --white-list https://ipfs.io,slideshare,https://img.shields.io,https://codeclimate.com/github/unixorn/awesome-zsh-plugins,www-s.acm.illinois.edu,https://mgdm.net,https://www.concourse.ci,https://grml.org/zsh/zsh-lovers.html,https://geeknote.me,https://en.ipip.net,https://docs.virtuozzo.com,kubernetes.io,https://youtube-dl.org,https://1password.com,https://iterm2.com,kafka.apache.org,https://mercurial-scm.org,https://hitokoto.cn,https://www.cyberciti.biz,https://keybase.io,https://exercism.io
+        args: /github/workspace/README.md --allow-timeout --allow 429,500,501,502,503,504,509,521 --allow-dupe --allow-ssl --request-delay 1 --allow-redirect --white-list https://ipfs.io,slideshare,https://img.shields.io,https://codeclimate.com/github/unixorn/awesome-zsh-plugins,www-s.acm.illinois.edu,https://mgdm.net,https://www.concourse.ci,https://grml.org/zsh/zsh-lovers.html,https://geeknote.me,https://en.ipip.net,https://docs.virtuozzo.com,kubernetes.io,https://youtube-dl.org,https://1password.com,https://iterm2.com,kafka.apache.org,https://mercurial-scm.org,https://hitokoto.cn,https://www.cyberciti.biz,https://keybase.io,https://exercism.io