Increase minimum memory to 256 MB for Cheerio Scraper

[nicklamonov]

Since the start of the year Cheerio Scraper had 75% of OOM runs (544 runs) with memory set below 200 MB.
Only 22 successful runs without OOM were below 200 MB.

Supporting stats.

• Run with 137 OOM error: https://docs.google.com/spreadsheets/d/1YepveuLkud-EtP9gYBd_zKkQ3myYGyuQDbOMz5fswcY/edit?gid=635095905#gid=635095905
• Run without OOM error https://docs.google.com/spreadsheets/d/1YepveuLkud-EtP9gYBd_zKkQ3myYGyuQDbOMz5fswcY/edit?gid=998927985#gid=998927985

So let's increase the minimum memory to 256 MB to avoid such errors.