chore(deps): update aiohttp requirement from <4,>=3.7.3 to >=3.13.5,<4

---
updated-dependencies:
- dependency-name: aiohttp
  dependency-version: 3.13.5
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements/optional.txt

@@ -3,7 +3,7 @@
 aiodns>1.0
 # We recommend using 3.7.1+ for RTMClient
 # https://github.com/slackapi/python-slack-sdk/issues/912
-aiohttp>=3.7.3,<4
+aiohttp>=3.13.5,<4
 # used only under slack_sdk/*_store
 boto3<=2
 # InstallationStore/OAuthStateStore