Update cxx requirement from 1,<1.0.87 to 1, <1.0.123

Updates the requirements on [cxx](https://github.com/dtolnay/cxx) to permit the latest version.
- [Release notes](https://github.com/dtolnay/cxx/releases)
- [Commits](dtolnay/cxx@1.0.0...1.0.122)

---
updated-dependencies:
- dependency-name: cxx
  dependency-type: direct:production
...

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

ceres-solver-sys/Cargo.toml

@@ -20,7 +20,7 @@ path = "../ceres-solver-src"
 optional = true
 
 [dependencies.cxx]
-version = "1,<1.0.87"  # 1.0.87 requires MSRV 1.60
+version = "1, <1.0.123"  # 1.0.87 requires MSRV 1.60
 features = ["c++17"]
 
 [build-dependencies]