Remove trailing blank line from generated clippy.toml

[leynos]

Summary

The generated clippy.toml currently includes an extra blank line at EOF.
When importing the Rust template into statelet, git diff --check reported:

clippy.toml:8: new blank line at EOF.

I removed the blank line locally before committing the template baseline.

Expected behaviour

Generated clippy.toml should end immediately after:

allow-expect-in-tests = true

with a single final newline, but no additional blank line.

Why this matters

The template should pass whitespace gates immediately after rendering/import.
This is a small issue, but it creates avoidable cleanup in downstream generated
repositories before the normal make fmt / lint workflow can proceed cleanly.

[leynos]

Additional whitespace artefact found from the same template import.

After importing the remaining template control files, the staged whitespace gate also reported:

.github/dependabot.yml:22: trailing whitespace.
+      
.github/dependabot.yml:22: new blank line at EOF.

I fixed this locally before committing by removing the final whitespace-only line. The generated .github/dependabot.yml should likewise end after:

    schedule:
      interval: "daily"

with a single final newline and no extra blank line.