ci: test downgrade CI for both v1 and LTS

Author: ven-k

.github/workflows/Downgrade.yml

@@ -15,14 +15,13 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        version: ['1']
+        version: ['1', 'lts']
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
       - uses: julia-actions/julia-downgrade-compat@v1
-#        if: ${{ matrix.version == '1.6' }}
         with:
           skip: Pkg,TOML
       - uses: julia-actions/julia-buildpkg@v1