chore(deps): update step-security/harden-runner digest to 20cf305 (#675)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| step-security/harden-runner | action | digest | `ec9f2d5` -> `20cf305`
|

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.github/workflows/stale.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@ec9f2d5744a09debf3a187a3f4f675c53b671911
+        uses: step-security/harden-runner@20cf305ff2072d973412fa9b1e3a4f227bda3c76 # v2.14.0
         with:
           egress-policy: audit