build(deps): bump dtolnay/rust-toolchain from 1.70 to 1.90

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from 1.70 to 1.90.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@1.70...1.90)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/ci.yaml

@@ -20,7 +20,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install stable toolchain
-        uses: dtolnay/rust-toolchain@1.74
+        uses: dtolnay/rust-toolchain@1.90
 
       - uses: Swatinem/rust-cache@v2
         with:
@@ -39,7 +39,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install stable toolchain
-        uses: dtolnay/rust-toolchain@1.74
+        uses: dtolnay/rust-toolchain@1.90
 
       - uses: Swatinem/rust-cache@v2
         with:
@@ -56,7 +56,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install stable toolchain
-        uses: dtolnay/rust-toolchain@1.74
+        uses: dtolnay/rust-toolchain@1.90
         with:
           components: rustfmt, clippy