fix(deps): update rust crate conquer-once to 0.3.0 [security]

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
conquer-once	dependencies	minor	0.2.0 -> 0.3.0

GitHub Vulnerability Alerts

CVE-2020-36208

Affected versions of conquer-once implements Sync for its OnceCell type without restricting it to Sendable types.

This allows non-Send but Sync types such as MutexGuard to be sent across threads leading to undefined behavior and memory corruption in concurrent programs.

The issue was fixed by adding a Send constraint to OnceCell.

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Release Notes

oliver-giersch/conquer-once (conquer-once)

v0.3.2

Compare Source

• fixes potential UB due to insufficiently strict bounds on Sync implementation for OnceCell (see Issue #​3)

v0.3.1

Compare Source

• fixes an apparent regression, requiring a new compiler than the stated 1.36.0

v0.3.0

• mostly internal refactorings
• adds the noblock module containing types which only allow non-blocking
  initialization
• raw is renamed to doc and hidden from documentation, but linked to from
  within the docs
• the Spin marker type is no longer exported

Release 0.3.1

• fixes an apparent regression, requiring a new compiler than the stated 1.36.0

Release 0.3.2

• fixes potential UB due to insufficiently strict bounds on Sync implementation for OnceCell (see Issue #​3)

Release 0.3.3

• improves and clarifies wording of public documentation
• improves internal documentation around all uses of unsafe code

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