chore(deps): update httpmock requirement from 0.7.0 to 0.8.0

Updates the requirements on [httpmock](https://github.com/httpmock/httpmock) to permit the latest version.
- [Release notes](https://github.com/httpmock/httpmock/releases)
- [Changelog](https://github.com/httpmock/httpmock/blob/master/CHANGELOG.md)
- [Commits](httpmock/httpmock@v0.7.0...v0.8.0)

---
updated-dependencies:
- dependency-name: httpmock
  dependency-version: 0.8.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

lambda-runtime/Cargo.toml

@@ -56,7 +56,7 @@ tower = { workspace = true, features = ["util"] }
 tracing = { version = "0.1", features = ["log"] }
 
 [dev-dependencies]
-httpmock = "0.7.0"
+httpmock = "0.8.0"
 hyper-util = { workspace = true, features = [
     "client",
     "client-legacy",