fix(ci): estate-wide structural CI fixes

- grant secret-scanner reusable its requested job permissions
- drop invalid timeout-minutes on reusable-call jobs
- drop hashFiles() from job-level if: expressions

Author: hyperpolymath

.github/workflows/mirror.yml

@@ -9,5 +9,4 @@ permissions:
 jobs:
   mirror:
     uses: hyperpolymath/standards/.github/workflows/mirror-reusable.yml@e6b2884722350515934d443daf23442f2195796f
-    timeout-minutes: 10
     secrets: inherit

.github/workflows/secret-scanner.yml

@@ -11,8 +11,11 @@ permissions:
   contents: read
 jobs:
   scan:
+    permissions:
+      contents: read
+      pull-requests: write
+      actions: read
     uses: hyperpolymath/standards/.github/workflows/secret-scanner-reusable.yml@3e4bd4c93911750727e2e4c66dff859e00079da0
-    timeout-minutes: 10
     secrets: inherit
   trufflehog:
     runs-on: ubuntu-latest