Add downgrade action

.github/workflows/Downgrade.yml

@@ -0,0 +1,33 @@
+name: Downgrade
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+    tags: '*'
+
+jobs:
+  test:
+    name: Downgrade dependencies (Julia ${{ matrix.julia-version }})
+    runs-on: ubuntu-latest
+    strategy:
+        matrix:
+            # Only test with Julia 1.10 until https://github.com/julia-actions/julia-downgrade-compat/issues/25 is fixed
+            julia-version: ['1.10']
+    steps:
+      - uses: actions/checkout@v5
+      - uses: julia-actions/setup-julia@v2
+        with:
+          version: ${{ matrix.julia-version }}
+      - uses: julia-actions/julia-downgrade-compat@v2
+        with:
+          mode: 'alldeps'
+          julia_version: ${{ matrix.julia-version }}
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+        with:
+          allow_reresolve: false
+          force_latest_compatible_version: false

Project.toml

@@ -26,7 +26,7 @@ DataFrames = "1"
 InlineStrings = "1.1"
 MappedArrays = "0.4"
 Missings = "1"
-PooledArrays = "1"
+PooledArrays = "1.2.1"
 PrecompileTools = "1"
 PrettyTables = "1, 2"
 ReadStat_jll = "1.1.9"