chore(openapi): move the upload headers to the POST method #3847

Job	Run time
matrix	20s
coverage	19m 42s
build / linux-amd64-pinned-all	1h 20m 30s
build / macos-amd64-pinned-all	1h 31m 5s
build / windows-amd64-pinned-unittest	39m 6s
build / windows-amd64-pinned-contract	24m 25s
build / windows-amd64-pinned-integration	1h 27m 3s
build / windows-amd64-pinned-tools	25m 44s
build / status	1s
	6h 7m 56s

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