[KRK 2026] Sponsors and agenda update

[ivellios]

• added sponsors
• added one talk to the agenda
• Updated the Splunk logo (now "Splunk, a Cisco company") as requested by the sponsor

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[phrawzty]

Modifications to sponsor images must be made using the change_sponsor_logo.sh script,
as noted in the docs.

[ivellios]

Thank you. Reset and replaced using the script.

[ivellios]

Also, @phrawzty - the script automatically modified static/img/sponsors/ -- I suppose due to the old events that used it? So I cannot remove it there, right?

[github-actions]

🚫 Blocked: sponsor assets directory change detected

This PR adds or modifies files under static/img/sponsors/.

These files should not be added or changed.

Please use the assets/sponsors/* directory instead.

Affected files:

• static/img/sponsors/splunk-before-20260622.png