[css-?] Update bin/requirements.txt to reduce vulnerabilities (w3c#10676)

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

Author: j9t

bin/requirements.txt

@@ -1 +1,7 @@
-bikeshed
+bikeshed
+aiohttp>=3.9.4 # not directly required, pinned by Snyk to avoid a vulnerability
+certifi>=2024.7.4 # not directly required, pinned by Snyk to avoid a vulnerability
+idna>=3.7 # not directly required, pinned by Snyk to avoid a vulnerability
+pillow>=10.3.0 # not directly required, pinned by Snyk to avoid a vulnerability
+requests>=2.32.2 # not directly required, pinned by Snyk to avoid a vulnerability
+urllib3>=1.26.19 # not directly required, pinned by Snyk to avoid a vulnerability