Bump tempfile from 3.19.1 to 3.20.0 (paritytech#3159)

Bumps [tempfile](https://github.com/Stebalien/tempfile) from 3.19.1 to 3.20.0.
- [Changelog](https://github.com/Stebalien/tempfile/blob/master/CHANGELOG.md)
- [Commits](Stebalien/tempfile@v3.19.1...v3.20.0)

---
updated-dependencies:
- dependency-name: tempfile
  dependency-version: 3.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -132,5 +132,5 @@ substrate-relay-helper = { git = "https://github.com/paritytech/polkadot-sdk", b
 bp-test-utils = { git = "https://github.com/paritytech/polkadot-sdk", branch = "master" }
 hex-literal = "0.4"
 sp-keyring = { git = "https://github.com/paritytech/polkadot-sdk", branch = "master" }
-tempfile = "3.19"
+tempfile = "3.20"
 finality-grandpa = { version = "0.16.2" }