🩹 [Enhancement]: Update Dependabot schedule and workflow versioning (#17)

Dependabot now checks for GitHub Actions updates daily instead of
weekly, with a 7-day cooldown period that prevents noisy update
notifications for rapidly iterating dependencies. Additionally, the
Process-PSModule workflow reference is now pinned to a specific commit
SHA for improved security and reproducibility.

- Fixes #16

## Dependabot daily schedule with cooldown

The dependabot configuration has been updated to use a daily schedule
with a 7-day cooldown period. This allows the repository to receive
dependency update notifications earlier while filtering out rapid
version churns that would otherwise create unnecessary PR noise.

```yaml
schedule:
  interval: daily
cooldown:
  default-days: 7
```

## Workflow action version pinning

The Process-PSModule reusable workflow is now pinned to commit SHA
`7c92b2ff94b965f4eaef272c3f3e0e766cd683f2` with a version comment `#
v5.4.0`. This follows security best practices by:

- Preventing unexpected behavior from tag mutations
- Ensuring reproducible workflow runs
- Making version information visible directly in the workflow file

Author: MariusStorhaug

.github/dependabot.yml

@@ -5,10 +5,12 @@
 
 version: 2
 updates:
-  - package-ecosystem: github-actions # See documentation for possible values
-    directory: / # Location of package manifests
+  - package-ecosystem: github-actions
+    directory: /
     labels:
       - dependencies
       - github-actions
     schedule:
-      interval: weekly
+      interval: daily
+    cooldown:
+      default-days: 7

.github/workflows/Process-PSModule.yml

@@ -27,7 +27,7 @@ permissions:
 
 jobs:
   Process-PSModule:
-    uses: PSModule/Process-PSModule/.github/workflows/workflow.yml@releasenotes
+    uses: PSModule/Process-PSModule/.github/workflows/workflow.yml@7c92b2ff94b965f4eaef272c3f3e0e766cd683f2 # v5.4.0
     secrets:
       APIKey: ${{ secrets.APIKey }}