[LIMA-2026] Update logo sponsor

[edanpiro]

This pull request updates the sponsor ID for "fluidattacks" to "fluidattacks-before-20260528" across multiple 2025 event configuration files, and adds a new sponsor metadata file for the updated ID. These changes ensure consistency in sponsor identification and likely reflect a change in sponsorship status or naming convention.

Sponsor ID updates across event files:

• Updated the sponsor ID from fluidattacks to fluidattacks-before-20260528 in the following event files:
  • data/events/2025/dallas/main.yml
  • data/events/2025/denver/main.yml
  • data/events/2025/lima/main.yml
  • data/events/2025/los-angeles/main.yml
  • data/events/2025/medellin/main.yml
  • data/events/2025/santiago/main.yml
  • data/events/2025/sao-paulo/main.yml

Sponsor metadata:

• Added a new sponsor metadata file data/sponsors/fluidattacks-before-20260528.yml with the sponsor's name and URL.

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[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/fluidattacks-before-20260528.png