Update Rust crate httpmock to 0.6.8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
httpmock	dev-dependencies	patch	0.6.6 -> 0.6.8

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Release Notes

alexliesenfeld/httpmock (httpmock)

v0.6.8

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• This is a maintenance release that updates all dependencies to the most recent version.
• Fixes some dependency issues with the Docker image.

v0.6.7

Compare Source

• This is a maintenance release that updates all dependencies to the most recent version.

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