Bump once_cell from 1.14.0 to 1.15.0

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.14.0 to 1.15.0.
- [Release notes](https://github.com/matklad/once_cell/releases)
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](matklad/once_cell@v1.14.0...v1.15.0)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -86,7 +86,7 @@ log = "0.4"
 
 cfg-if = "1"
 pin-project = "1.0"
-once_cell = "1.13"
+once_cell = "1.15"
 thiserror = "1.0"
 arc-swap = "1.5"
 

crates/shadowsocks-service/Cargo.toml

@@ -53,7 +53,7 @@ cfg-if = "1"
 byte_string = "1.0"
 base64 = "0.13"
 url = "2.2"
-once_cell = "1.13"
+once_cell = "1.15"
 spin = { version = "0.9", features = ["std"] }
 pin-project = "1.0"
 bloomfilter = { version = "1.0.8", optional = true }