Update pyo3 requirement from 0.25 to 0.26

Updates the requirements on [pyo3](https://github.com/pyo3/pyo3) to permit the latest version.
- [Release notes](https://github.com/pyo3/pyo3/releases)
- [Changelog](https://github.com/PyO3/pyo3/blob/main/CHANGELOG.md)
- [Commits](PyO3/pyo3@v0.25.0...v0.26.0)

---
updated-dependencies:
- dependency-name: pyo3
  dependency-version: 0.26.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.toml

@@ -120,11 +120,11 @@ futures = "0.3"
 inventory = { version = "0.3", optional = true }
 once_cell = "1.14"
 pin-project-lite = "0.2"
-pyo3 = "0.25"
+pyo3 = "0.26"
 pyo3-async-runtimes-macros = { path = "pyo3-async-runtimes-macros", version = "=0.25.0", optional = true }
 
 [dev-dependencies]
-pyo3 = { version = "0.25", features = ["macros"] }
+pyo3 = { version = "0.26", features = ["macros"] }
 
 [dependencies.async-std]
 version = "1.12"