[codecane] Switch from macos-13 to macos-15-intel #4467

Job	Run time
build-and-check	3m 4s
test-.agents	58s
test-common	56s
test-packages/billing	59s
test-npm-app	58s
test-cli	1m 14s
test-backend	1m 0s
test-packages/agent-runtime	1m 7s
test-packages/internal	57s
test-web	1m 1s
test-sdk	1m 9s
test-integration-common	57s
test-integration-cli	1m 5s
test-integration-.agents	58s
test-integration-backend	1m 4s
test-integration-npm-app	1m 6s
test-integration-packages/agent-runtime	1m 1s
test-integration-web	57s
test-integration-packages/internal	1m 3s
test-integration-sdk	1m 12s
test-integration-packages/billing	57s
	23m 43s

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