chore(deps): bump juniper from 0.15.11 to 0.15.12

Bumps [juniper](https://github.com/graphql-rust/juniper) from 0.15.11 to 0.15.12.
- [Release notes](https://github.com/graphql-rust/juniper/releases)
- [Changelog](https://github.com/graphql-rust/juniper/blob/master/release.toml)
- [Commits](https://github.com/graphql-rust/juniper/compare/juniper-v0.15.11...juniper-v0.15.12)

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

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

Cargo.lock

@@ -4303,9 +4303,9 @@ dependencies = [
 
 [[package]]
 name = "juniper"
-version = "0.15.11"
+version = "0.15.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52adf17d43d0b526eed31fac15d9312941c5c2558ffbfb105811690b96d6e2f1"
+checksum = "875dca5a0c08b1521e1bb0ed940e9955a9f38971008aaa2a9f64a2ac6b59e1b5"
 dependencies = [
  "async-trait",
  "bson 1.2.4",