chore: update gambling from upstream sources

[github-actions]

🤖 Automated Upstream Update: gambling

This PR was automatically generated by the upstream monitoring system.

📊 Summary

• List: gambling.txt
• New domains: 50578
• Removed domains: 0
• Sources checked: 2

📡 Source Details

Source 1: gambling.txt

• URL: https://cdn.jsdelivr.net/gh/hagezi/dns-blocklists@latest/adblock/gambling.txt
• Upstream total: 336459 domains
• New domains: 50578

Sample of new domains (showing 10 of 50578):

0-7-0-7s.casino
0-8-07c.casino
0-g-j-3.com
0-o-x-h.com
0-w-v-s.com
0-x-g-5.com
0007-casino.xyz
000casinos.com
001.casino
0029.top

Source 2: Gambling

• URL: https://raw.githubusercontent.com/ShadowWhisperer/BlockLists/refs/heads/master/Lists/Gambling
• Upstream total: 9597 domains
• New domains: 0

✅ Validation

• New domains are relevant to the {list_name} category
• No false positives identified
• Domains pass validation checks
• Build succeeds

🔄 Merge Policy

🔴 Manual review required - Changes exceed threshold (>100 domains)

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This PR was created by the upstream monitoring workflow.
To disable upstream monitoring for this list, remove the upstream_sources section from config/lists.yml.