chore: release v0.12.2 (#134)

## 🤖 New release
* `portgraph`: 0.12.1 -> 0.12.2

<details><summary><i><b>Changelog</b></i></summary><p>

<blockquote>

## [0.12.2](v0.12.1...v0.12.2)
- 2024-07-05

### Bug Fixes
- Intergraph edges in mermaid rendering
([#139](#139))

### New Features
- Add PortOffset::opposite
([#136](#136))
- Efficient LCA algorithm for the hierarchy
([#138](#138))

### Testing
- Use `insta` for mermaid/dot render tests
([#137](#137))
</blockquote>


</p></details>

---
This PR was generated with
[release-plz](https://github.com/MarcoIeni/release-plz/).

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [0.12.2](https://github.com/CQCL/portgraph/compare/v0.12.1...v0.12.2) - 2024-07-05
+
+### Bug Fixes
+- Intergraph edges in mermaid rendering ([#139](https://github.com/CQCL/portgraph/pull/139))
+
+### New Features
+- Add PortOffset::opposite ([#136](https://github.com/CQCL/portgraph/pull/136))
+- Efficient LCA algorithm for the hierarchy ([#138](https://github.com/CQCL/portgraph/pull/138))
+
+### Testing
+- Use `insta` for mermaid/dot render tests ([#137](https://github.com/CQCL/portgraph/pull/137))
+
 ## [0.12.1](https://github.com/CQCL/portgraph/compare/v0.12.0...v0.12.1) - 2024-06-03
 
 ### Bug Fixes

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "portgraph"
-version = "0.12.1"
+version = "0.12.2"
 license = "Apache-2.0"
 
 readme = "README.md"