[DEN-2026] update sponsors: software defined talk podcast, devITjobs

[themightymuppet]

• updates the logo for software defined talk podcast using the update logo script
• updates the clickthrough link for devITjobs per request from the head of brand and comms
• adds both sponsors to denver 2026 community sponsor level
• updates existing references to use the updated old asset.

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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/softwaredefinedtalk-before-20260422.png

[themightymuppet]

cc @swmonkeys

[themightymuppet]

hi @toshywoshy ! Wondering if this check Blocked: sponsor assets directory change detected is still valid in this case where the logo was updated. Should I migrate everything (including the old ones) over to the new asset directory? I can also help update the "update logo" script if that's the case.