Set github actions to specific commits

.github/workflows/ctests.yml

@@ -20,8 +20,8 @@ jobs:
     env:
       SSPICE_DEBUG: y
     steps:
-    - uses: actions/checkout@v2
-    - uses: conda-incubator/setup-miniconda@v2
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+    - uses: conda-incubator/setup-miniconda@3b0f2504dd76ef23b6d31f291f4913fb60ab5ff3
       with:
           miniconda-version: "latest"
           activate-environment: csmswig