Change CI to SHA versioning (#457)

Author: paddyroddy

.github/workflows/paper.yaml

@@ -16,7 +16,8 @@ jobs:
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
 
       - name: Build draft PDF
-        uses: openjournals/openjournals-draft-action@master
+        # yamllint disable-line rule:line-length
+        uses: openjournals/openjournals-draft-action@85a18372e48f551d8af9ddb7a747de685fbbb01c # v1.0
         with:
           journal: joss
           paper-path: paper/paper.md