chore(deps): update dependency req to v0.5.16

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
req (source)	prod	patch	0.5.15 → 0.5.16

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Release Notes

wojtekmach/req (req)

v0.5.16

Compare Source

• [Req.Test]: Fix verify_on_exit! accidentally using Mox name
  • [auth]: Support MFArgs
  • [auth]: Support digest auth
  • [put_aws_sigv4]: Support MFArgs
  • [put_path_params]: Encode :path_params even with reserved characters
  • [put_path_params]: Set :path_params_template on empty params
  • [run_plug]: Handle compressed request body

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