Tests update key fingerprint

[blackboxsw]

Proposed Commit Message

tests: update keyserver PPA key fur curtin-dev

Commit 8470af00 changes the integration test keyserver PPA to
ppa:curtin-dev/daily. Update the asserttion key fingerprint.

Additional Context

Failed jenkins job
https://jenkins.canonical.com/server-team/view/cloud-init/job/cloud-init-integration-jammy-lxd_container/454/testReport/junit/tests.integration_tests.modules.test_apt_functionality/TestApt/test_keyserver/

Test Steps

CLOUD_INIT_OS_IMAGE=oracular CLOUD_INIT_PLATFORM=lxd_container CLOUD_INIT_CLOUD_INIT_SOURCE=ppa:cloud-init-dev/daily tox -e integration-tests -- tests/integration_tests/modules/test_apt_functionality.py::TestApt::test_keyserver 

Merge type

• Squash merge using "Proposed Commit Message"
• Rebase and merge unique commits. Requires commit messages per-commit each referencing the pull request number (#<PR_NUM>)

[aciba90]

LGTM, thanks!