chore(deps): bump once_cell from 1.9.0 to 1.10.0

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.9.0 to 1.10.0.
- [Release notes](https://github.com/matklad/once_cell/releases)
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](https://github.com/matklad/once_cell/compare/v1.9.0...v1.10.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.lock

@@ -306,9 +306,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.9.0"
+version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da32515d9f6e6e489d7bc9d84c71b060db7247dc035bbe44eac88cf87486d8d5"
+checksum = "87f3e037eac156d1775da914196f0f37741a274155e34a0b7e427c35d2a2ecb9"
 
 [[package]]
 name = "pem"

Cargo.toml

@@ -19,7 +19,7 @@ getopts = "0.2.21"
 glob = "0.3"
 log = "0.4"
 mime_guess = "2.0"
-once_cell = "1.8"
+once_cell = "1.10"
 percent-encoding = "2.1"
 rcgen = { version = "0.9.2" }
 rustls = "0.20.4"