update-ncov-gisaid-clade-counts: Bump memory

[joverlee521]

Previous triggered run¹ failed with a memory error

zstd: error 70 : Write error : cannot write decoded block : Cannot allocate memory

¹ https://github.com/nextstrain/forecasts-ncov/actions/runs/8203385071

Checklist

• [x] Checks pass
• [x] Manually triggered run