build(deps): bump subtle from 2.5.0 to 2.6.1

Bumps [subtle](https://github.com/dalek-cryptography/subtle) from 2.5.0 to 2.6.1.
- [Changelog](https://github.com/dalek-cryptography/subtle/blob/main/CHANGELOG.md)
- [Commits](dalek-cryptography/subtle@2.5.0...2.6.1)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -18,7 +18,7 @@ num-traits = { version = "0.2.9", default-features = false, features = ["libm"]
 num-integer = { version = "0.1.39", default-features = false }
 rand_core = { version = "0.6.4", default-features = false }
 const-oid = { version = "0.10.0-rc.0", default-features = false }
-subtle = { version = "2.1.1", default-features = false }
+subtle = { version = "2.6.1", default-features = false }
 digest = { version = "=0.11.0-pre.9", default-features = false, features = ["alloc", "oid"] }
 pkcs1 = { version = "0.8.0-rc.0", default-features = false, features = ["alloc", "pkcs8"] }
 pkcs8 = { version = "0.11.0-rc.0", default-features = false, features = ["alloc"] }