chore: release v0.12.0 (#123)

## 🤖 New release
* `portgraph`: 0.11.0 -> 0.12.0 (⚠️ API breaking changes)

### ⚠️ `portgraph` breaking changes

```
--- failure enum_missing: pub enum removed or renamed ---

Description:
A publicly-visible enum cannot be imported by its prior path. A `pub use` may have been removed, or the enum itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.29.1/src/lints/enum_missing.ron

Failed in:
  enum portgraph::dot::PortStyle, previously in file /tmp/.tmpRl5Civ/portgraph/src/dot.rs:33
  enum portgraph::dot::EdgeStyle, previously in file /tmp/.tmpRl5Civ/portgraph/src/dot.rs:74
  enum portgraph::dot::NodeStyle, previously in file /tmp/.tmpRl5Civ/portgraph/src/dot.rs:10

--- failure module_missing: pub module removed or renamed ---

Description:
A publicly-visible module cannot be imported by its prior path. A `pub use` may have been removed, or the module may have been renamed, removed, or made non-public.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.29.1/src/lints/module_missing.ron

Failed in:
  mod portgraph::dot, previously in file /tmp/.tmpRl5Civ/portgraph/src/dot.rs:1

--- failure struct_missing: pub struct removed or renamed ---

Description:
A publicly-visible struct cannot be imported by its prior path. A `pub use` may have been removed, or the struct itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.29.1/src/lints/struct_missing.ron

Failed in:
  struct portgraph::dot::DotFormatter, previously in file /tmp/.tmpRl5Civ/portgraph/src/dot.rs:99

--- failure trait_missing: pub trait removed or renamed ---

Description:
A publicly-visible trait cannot be imported by its prior path. A `pub use` may have been removed, or the trait itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.29.1/src/lints/trait_missing.ron

Failed in:
  trait portgraph::dot::DotFormat, previously in file /tmp/.tmpRl5Civ/portgraph/src/dot.rs:359
```

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

<blockquote>

## 0.12.0 (2024-03-01)

### Features

- Proptest for Multiportgraph
- (Multi)Portgraph implement Arbitrary
- [**breaking**] Mermaid rendering
([#125](#125))

### Miscellaneous Tasks

- [**breaking**] Hike MSRV to 1.75
</blockquote>


</p></details>

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

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## 0.12.0 (2024-03-01)
+
+### Features
+
+- Proptest for Multiportgraph
+- (Multi)Portgraph implement Arbitrary
+- [**breaking**] Mermaid rendering ([#125](https://github.com/CQCL/portgraph/pull/125))
+
+### Miscellaneous Tasks
+
+- [**breaking**] Hike MSRV to 1.75
+
 ## 0.11.0 (2023-12-14)
 
 ### Features

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "portgraph"
-version = "0.11.0"
+version = "0.12.0"
 license = "Apache-2.0"
 
 readme = "README.md"