fix(ci): install cargo-release with +stable toolchain

The repo's rust-toolchain.toml pins 1.90.0, which overrides the
workflow's stable setup during cargo install. cargo-release 1.1.2
requires rustc 1.91, so the install fails. Use +stable to compile
the helper CLIs against the latest toolchain regardless of the repo
override. Same fix applied to cargo-get to prevent future drift.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: kariy

.github/workflows/release-dispatch.yml

@@ -26,12 +26,12 @@ jobs:
       - run: |
           VERSION=${{ inputs.version }}
           VERSION=${VERSION#v}
-          cargo install cargo-release --locked
+          cargo +stable install cargo-release --locked
           cargo release version $VERSION --execute --no-confirm && cargo release replace --execute --no-confirm
 
       - id: version_info
         run: |
-          cargo install cargo-get --locked
+          cargo +stable install cargo-get --locked
           echo "version=$(cargo get workspace.package.version)" >> $GITHUB_OUTPUT
 
       - uses: peter-evans/create-pull-request@v7