fix(ci): avoid stale Bun dependency caches (#49845)

Co-authored-by: jlongster <17031+jlongster@users.noreply.github.com>

.github/actions/setup-bun/action.yml

@@ -53,8 +53,6 @@ runs:
       with:
         path: ${{ steps.cache.outputs.dir }}
         key: ${{ runner.os }}-bun-${{ hashFiles('**/bun.lock') }}
-        restore-keys: |
-          ${{ runner.os }}-bun-
 
     - name: Install setuptools for distutils compatibility
       run: python3 -m pip install setuptools || pip install setuptools || true
@@ -66,9 +64,9 @@ runs:
         # e.g. ./patches/ for standard-openapi
         # https://github.com/oven-sh/bun/issues/28147
         if [ "$RUNNER_OS" = "Windows" ]; then
-          bun install --linker hoisted ${{ inputs.install-flags }}
+          bun install --frozen-lockfile --linker hoisted ${{ inputs.install-flags }}
         else
-          bun install ${{ inputs.install-flags }}
+          bun install --frozen-lockfile ${{ inputs.install-flags }}
         fi
       shell: bash