Update pprof requirement from 0.6 to 0.7 (#1305)

Updates the requirements on [pprof](https://github.com/tikv/pprof-rs) to permit the latest version.
- [Release notes](https://github.com/tikv/pprof-rs/releases)
- [Changelog](https://github.com/tikv/pprof-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tikv/pprof-rs/commits)

---
updated-dependencies:
- dependency-name: pprof
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -70,7 +70,7 @@ proptest = "1.0"
 criterion = "0.3.5"
 test-log = "0.2.8"
 env_logger = "0.9.0"
-pprof = {version= "0.6", features=["flamegraph", "criterion"]}
+pprof = {version= "0.7", features=["flamegraph", "criterion"]}
 
 [dev-dependencies.fail]
 version = "0.5"