• support Python 3.15 and declare it in the package classifiers (#1780)
• bump botocore dependency specification to support
  "botocore >= 1.43.115, < 1.43.118" (#1772, #1779, #1789)
• update AioRefreshableCredentials and AioDeferredRefreshableCredentials
  to match botocore's revised credential refresh logic (staged expiry time
  published together with the refreshed credentials) (#1789)
• allow multidict 7.x (dependency range widened to < 8.0.0) (#1786)