fix: do not try to symlink unpublished versions

Author: amitds1997

.github/workflows/installation_test.yml

@@ -46,7 +46,7 @@ jobs:
       matrix:
         config:
           - {instance: macos-13, arch: x86_64}
-          - {instance: macos-latest, arch: arm64}
+          - {instance: macos-15, arch: arm64}
         install_method: [binary, source]
         neovim_version: [stable, nightly, v0.9.0]
     runs-on: ${{ matrix.config.instance }}
@@ -68,13 +68,16 @@ jobs:
           - {instance: ubuntu-latest, arch: x86-64}
           - {instance: ubuntu-24.04-arm, arch: arm64}
           - {instance: macos-13, arch: x86_64}
-          - {instance: macos-latest, arch: arm64}
+          - {instance: macos-15, arch: arm64}
         neovim_version: [stable, nightly, v0.9.0]
     runs-on: ${{ matrix.config.instance }}
     steps:
       - uses: actions/checkout@v4
       - uses: rhysd/action-setup-vim@v1
         name: Install Neovim
+        if: >
+          ${{ matrix.neovim_version == 'v0.9.0' &&
+          matrix.config.arch != 'arm64' }}
         with:
           neovim: true
           version: ${{ matrix.neovim_version }}