Bump anyhow from 1.0.63 to 1.0.64

Bumps [anyhow](https://github.com/dtolnay/anyhow) from 1.0.63 to 1.0.64.
- [Release notes](https://github.com/dtolnay/anyhow/releases)
- [Commits](dtolnay/anyhow@1.0.63...1.0.64)

---
updated-dependencies:
- dependency-name: anyhow
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -5,7 +5,7 @@ authors = ["Fastly <[email protected]>"]
 edition = "2018"
 
 [dependencies]
-anyhow = "1.0.63"
+anyhow = "1.0.64"
 env_logger = "0.9.0"
 log = "0.4.17"
 structopt = "0.3.20"