Update http-zipkin requirement from 0.3 to 0.4

[dependabot[bot]]

Updates the requirements on http-zipkin to permit the latest version.

Release notes

Sourced from http-zipkin's releases.

http-zipkin 0.4.0

• Bump http to 1.

Commits

• bd2c366 Merge pull request #46 from palantir/http-zipkin-0.4
• 67b38d2 Release http-zipkin 0.4.0
• d829fa6 Merge pull request #44 from palantir/dependabot/cargo/http-1.0
• ffe3ea0 Merge pull request #45 from palantir/excavator/policy-bot-oss
• 26b62de Excavator: Update policy-bot config
• e0e1632 Merge pull request #43 from palantir/excavator/policy-bot-oss
• 87ab535 Update http requirement from 0.2 to 1.0
• 144b655 Excavator: Update policy-bot config
• 60c3742 Excavator: Update policy-bot config (#42)
• 49b63e6 Merge pull request #41 from palantir/dependabot/cargo/syn-2.0
• Additional commits viewable in compare view

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[changelog-app[bot]]

Generate changelog in changelog-dir>`changelog/@unreleased`</changelog-dir

What do the change types mean?

- `feature`: A new feature of the service. - `improvement`: An incremental improvement in the functionality or operation of the service. - `fix`: Remedies the incorrect behaviour of a component of the service in a backwards-compatible way. - `break`: Has the potential to break consumers of this service's API, inclusive of both Palantir services and external consumers of the service's API (e.g. customer-written software or integrations). - `deprecation`: Advertises the intention to remove service functionality without any change to the operation of the service itself. - `manualTask`: Requires the possibility of manual intervention (running a script, eyeballing configuration, performing database surgery, ...) at the time of upgrade for it to succeed. - `migration`: A fully automatic upgrade migration task with no engineer input required. _Note: only one type should be chosen._

How are new versions calculated?

- ❗The `break` and `manual task` changelog types will result in a major release! - 🐛 The `fix` changelog type will result in a minor release in most cases, and a patch release version for patch branches. This behaviour is configurable in autorelease. - ✨ All others will result in a minor version release.

Type

- [ ] Feature - [ ] Improvement - [ ] Fix - [ ] Break - [ ] Deprecation - [ ] Manual task - [ ] Migration

Description

Update http-zipkin requirement from 0.3 to 0.4 **Check the box to generate changelog(s)** - [ ] Generate changelog entry

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.