fix: upgrade verify-hello-app action to v2.0.1

[kinyoklion]

Summary

CI has been failing daily because the verify-hello-app action v1.0.1 sets the env var LAUNCHDARKLY_SERVER_KEY, but Hello.java was previously updated to read LAUNCHDARKLY_SDK_KEY. This upgrades the action to v2.0.1, which sets LAUNCHDARKLY_SDK_KEY to match.

Also fixes a missing trailing newline in ci.yml.

Review & Testing Checklist for Human

• Verify that verify-hello-app v2.0.1 has no other breaking changes beyond the env var rename (the action inputs use_server_key, role_arn, command appear unchanged). The grep pattern in v2 changed from grep -iE "is true for this context|feature flag evaluates to true" to grep -i "feature flag evaluates to true" — confirm Hello.java's output (feature flag evaluates to) still matches.
• Confirm CI passes on this PR (this is the real validation — the change cannot be tested locally since it depends on AWS OIDC + SSM parameters only available in CI).

Notes

• Requested by: @kinyoklion
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