Fix URL scheme in deprecation message

[kikitux]

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• I have added unit tests to cover the new behavior under tests/unittests/
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• I have added a reference to issues that this PR relates to in the PR message (Refs integration: do not LXD bind mount /etc/cloud/cloud.cfg.d #1234, Fixes integration: do not LXD bind mount /etc/cloud/cloud.cfg.d #1234)
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Proposed Commit Message

Updates a missed colon : on deprecation notice for nocloud-net

# as now
2025-11-08 08:59:02,803 - lifecycle.py[DEPRECATED]: The 'nocloud-net' datasource name is deprecated in 24.1 and scheduled to be removed in 29.1. Use 'nocloud' instead, which uses the seedfrom protocolscheme (http// or file://) to decide how to run.

Additional Context

Test Steps

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

[blackboxsw]

Thank you for this contribution @kikitux and making cloud-init better.

[blackboxsw]

Tests currently failing are unrelated to this changeset.