server/authorizer: Fix gzip payload handling. #10387

Job	Run time
YAML Lint	16s
Go Lint	1m 31s
Generate Code	1m 7s
Rego PR checks	1m 38s
WASM	10s
Go Build (linux amd64)	2m 20s
Check Generated	23s
Go Build (linux arm64)	2m 0s
Go Test (linux)	4m 36s
Go compat build/test (ubuntu-22.04, 1.21)	3m 29s
Go Build (linux arm64GO_TAGS="-tags=opa_no_oci")	2m 3s
Go Test (darwin)	4m 17s
Go compat build/test (macos-14, 1.21)	3m 56s
Go Build (windows amd64)	2m 25s
Go Race Detector	6m 3s
Go Build (darwin amd64)	1m 27s
Go Build (darwin arm64)	46s
docker image smoke test	25s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64, amd64)	13s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64_static, amd64, disabled)	15s
smoke-test-binaries (darwin, macos-13, opa_darwin_amd64, amd64)	26s
smoke-test-binaries (darwin, macos-14, opa_darwin_arm64_static, arm64, disabled)	15s
smoke-test-binaries (windows, windows-latest, opa_windows_amd64.exe, amd64)	43s
	40m 44s

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