ci: Use sed in a replace manner instead of add

Author: maxrake

action.yml

@@ -49,7 +49,7 @@ runs:
       run: |
         export PATH="$HOME/.phylum:$PATH"
         phylum version
-        sed -i "5 a \  offline_access: ${{ inputs.phylum_token }}" ~/.phylum/settings.yaml
+        sed -i "s/offline_access:.*/offline_access: ${{ inputs.phylum_token }}/" ~/.phylum/settings.yaml
         echo "[*] Configured phylum-cli with token"
 
     - name: Test phylum