chore(deps): Update Rust Stable to v1.91 (#156)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [STABLE](https://redirect.github.com/rust-lang/rust) | minor | `1.90`
-> `1.91` |

---

### Release Notes

<details>
<summary>rust-lang/rust (STABLE)</summary>

###
[`v1.91`](https://redirect.github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1911-2025-11-10)

[Compare
Source](https://redirect.github.com/rust-lang/rust/compare/1.90.0...1.91.0)

\===========================

<a id="1.91.1"></a>

- [Enable file locking support in
illumos](https://redirect.github.com/rust-lang/rust/pull/148322). This
fixes Cargo not locking the build directory on illumos.
- [Fix `wasm_import_module` attribute
cross-crate](https://redirect.github.com/rust-lang/rust/pull/148363).
This fixes linker errors on WASM targets.

</details>

---

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---

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.github/workflows/ci.yml

@@ -107,7 +107,7 @@ jobs:
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:
-        toolchain: "1.90"  # STABLE
+        toolchain: "1.91"  # STABLE
     - uses: Swatinem/rust-cache@v2
     - name: Check documentation
       env:
@@ -122,7 +122,7 @@ jobs:
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:
-        toolchain: "1.90"  # STABLE
+        toolchain: "1.91"  # STABLE
         components: rustfmt
     - uses: Swatinem/rust-cache@v2
     - name: Check formatting
@@ -138,7 +138,7 @@ jobs:
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:
-        toolchain: "1.90"  # STABLE
+        toolchain: "1.91"  # STABLE
         components: clippy
     - uses: Swatinem/rust-cache@v2
     - name: Install SARIF tools