Use julia-downgrade-compat@2 (#227)

Co-authored-by: Hendrik Ranocha <ranocha@users.noreply.github.com>

Author: JoshuaLampert

.github/dependabot.yml

@@ -10,6 +10,3 @@ updates:
       all-github-actions:
         patterns:
           - "*"
-    ignore:
-      - dependency-name: "julia-actions/julia-downgrade-compat"
-        versions: [ ">=2.0.0" ]

.github/workflows/Downgrade.yml

@@ -48,16 +48,20 @@ jobs:
           version: ${{ matrix.version }}
       - run: julia -e 'using InteractiveUtils; versioninfo(verbose=true)'
       - uses: julia-actions/cache@v2
-      - uses: julia-actions/julia-downgrade-compat@v1
+      - uses: julia-actions/julia-downgrade-compat@v2
         with:
           skip: LinearAlgebra,Printf,SparseArrays,DelimitedFiles,Test
           projects: ., test
-      - uses: julia-actions/julia-buildpkg@v1
-        env:
-          PYTHON: ""
-      - name: Run tests without coverage
-        uses: julia-actions/julia-runtest@v1
-        with:
-          coverage: false
-        env:
-          PYTHON: ""
+          mode: forcedeps
+      # We run the tests manually instead of using julia-action/julia-builpkg and julia-action/julia-runtest or `Pkg.test`
+      # because otherwise the downgraded Manifest.toml is not used in the tests under julia <v1.12
+      # see also https://github.com/julia-actions/julia-downgrade-compat/blob/00f940b7be2b50389571ed016d603be561649103/README.md#L89
+      - name: Run tests
+        run: |
+          julia --project=test --color=yes -e '
+            import Pkg
+            Pkg.develop(Pkg.PackageSpec(path=pwd()))
+            Pkg.instantiate()
+            Pkg.status(; mode = Pkg.PKGMODE_MANIFEST)
+            include("test/runtests.jl")
+          '

Project.toml

@@ -38,13 +38,13 @@ PolynomialBases = "0.4.15"
 PreallocationTools = "0.4.23, 1"
 Printf = "1"
 RecipesBase = "1.3.4"
-RecursiveArrayTools = "3.27"
+RecursiveArrayTools = "3.27.2"
 Reexport = "1.2.2"
 Roots = "2.0.17"
 SciMLBase = "2.78"
 SimpleUnPack = "1.1"
 SparseArrays = "1"
-StaticArrays = "1.9.7"
+StaticArrays = "1.9.8"
 SummationByPartsOperators = "0.5.79"
 TimerOutputs = "0.5.25"
 TrixiBase = "0.1.6"

test/Project.toml

@@ -20,7 +20,7 @@ ForwardDiff = "0.10.36, 1"
 OrdinaryDiffEqLowStorageRK = "1.1"
 OrdinaryDiffEqRosenbrock = "1.9"
 OrdinaryDiffEqTsit5 = "1.1"
-Plots = "1.25"
+Plots = "1.38.9"
 SparseArrays = "1"
 SummationByPartsOperators = "0.5.79"
 Test = "1"