don't try allocating a port to upload a docs release to s3

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #5346 from SvenDowideit/dont-alocate-port-for-docs-release

Remove port allocation from `make docs-release`