Increase proxy buffer sizes #186

Job	Run time
Lookup derivates	5s
HTTPS Proxy (base, linux/arm64)	27s
HTTPS Proxy (nextjs, linux/arm64)	30s
HTTPS Proxy (storybook, linux/amd64)	25s
HTTPS Proxy (base, linux/amd64)	24s
HTTPS Proxy (nextjs, linux/amd64)	24s
HTTPS Proxy (vite, linux/arm64)	22s
HTTPS Proxy (vite, linux/amd64)	21s
HTTPS Proxy (drupal, linux/arm64)	26s
HTTPS Proxy (proxy, linux/arm64)	30s
HTTPS Proxy (proxy, linux/amd64)	24s
HTTPS Proxy (storybook, linux/arm64)	20s
HTTPS Proxy (drupal, linux/amd64)	31s
	5m 9s

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