Pin mitlibraries/.github action to 6886f95

Author: renovate[bot]

.github/workflows/ci.yml

@@ -2,6 +2,6 @@ name: CI
 on: push
 jobs:
   test:
-    uses: mitlibraries/.github/.github/workflows/python-shared-test.yml@main
+    uses: mitlibraries/.github/.github/workflows/python-shared-test.yml@6886f9574e40fab796c127d7e14d8db356c99124 # main
   lint:
-    uses: mitlibraries/.github/.github/workflows/python-shared-lint.yml@main
+    uses: mitlibraries/.github/.github/workflows/python-shared-lint.yml@6886f9574e40fab796c127d7e14d8db356c99124 # main