v1.11.0

• Feature: Full support for PHP 8.1 release.
  (#277 by @clue)

• Feature: Avoid dependency on ext-filter.
  (#279 by @clue)

• Improve test suite to skip FD test when hitting memory limit
  and skip legacy TLS 1.0 tests if disabled by system.
  (#278 and #281 by @clue and #283 by @SimonFrings)