chore(deps): update xa11y requirement from >=0.9.0 to >=0.9.1 (#471)

Updates the requirements on [xa11y](https://github.com/xa11y/xa11y) to permit the latest version.
- [Release notes](https://github.com/xa11y/xa11y/releases)
- [Changelog](https://github.com/xa11y/xa11y/blob/main/release.toml)
- [Commits](xa11y/xa11y@v0.9.0...v0.9.1)

---
updated-dependencies:
- dependency-name: xa11y
  dependency-version: 0.9.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Karthik Bekal Pattathana <133984042+karthikbekalp@users.noreply.github.com>

Author: dependabot[bot]

requirements-testing.txt

@@ -15,4 +15,4 @@ openjd-cli == 0.7.*
 fonttools >= 4.0.0
 # Drives the real submitter dialog via the OS accessibility tree.
 # Used by test/integ_xa11y/.
-xa11y >= 0.9.0
+xa11y >= 0.9.1