build(deps): update dagger-io requirement in /.dagger-ci/daggerci

Updates the requirements on [dagger-io](https://github.com/dagger/dagger) to permit the latest version.
- [Release notes](https://github.com/dagger/dagger/releases)
- [Changelog](https://github.com/dagger/dagger/blob/main/CHANGELOG.md)
- [Commits](dagger/dagger@v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: dagger-io
  dependency-version: 0.20.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.dagger-ci/daggerci/requirements.txt

@@ -1,5 +1,5 @@
 anyio~=4.12
-dagger-io~=0.19
+dagger-io~=0.20
 prettytable~=3.17
 pytest~=9.0
 pytest-benchmark~=5.2