chore: update gpt-5.5 family pricing (#757) #852

Job	Run time
build-and-smoke-freebuff-windows	2m 43s
build-freebuff	1m 5s
e2e-startup	1m 4s
e2e-terminal-command	1m 8s
e2e-code-edit	1m 6s
e2e-agent-startup	2m 11s
e2e-version	1m 0s
e2e-slash-commands	58s
e2e-help-command	1m 9s
e2e-ads-behavior	1m 2s
	13m 26s

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