Use HTTPS for external event URL in Droidcon17 sample

[vagesh10]

This PR updates the external event URL in the Droidcon17 sample from HTTP to HTTPS.

Reason:
Using HTTPS improves security and reflects modern web standards in sample data.

Summary by Sourcery

Enhancements:

• Update the external event URL in the Droidcon17 sample data to use HTTPS rather than HTTP.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the Droidcon17 sample's external event URL to use HTTPS instead of HTTP for improved security and modern web compliance.

File-Level Changes

Change	Details	Files
Switch external event URL in the Droidcon17 sample data from HTTP to HTTPS.	Locate the external event URL in the Droidcon17 sample event data file. Change the scheme of the URL from http:// to https:// while preserving the rest of the URL.	sample/Droidcon17/event

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