Docs: Upgrade checkout and cspell-action versions (#2501)

Signed-off-by: Christian Oliff <[email protected]>

Author: coliff

README.md

@@ -16,14 +16,16 @@ jobs:
   spellcheck: # run the action
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: streetsidesoftware/cspell-action@v7
+      - uses: actions/checkout@v5
+        with:
+          persist-credentials: false
+      - uses: streetsidesoftware/cspell-action@v8
 ```
 
 ## Usage
 
 ```yaml
-- uses: streetsidesoftware/cspell-action@v7
+- uses: streetsidesoftware/cspell-action@v8
   with:
     # Define glob patterns to filter the files to be checked. Use a new line between patterns to define multiple patterns.
     # The default is to check ALL files that were changed in in the pull_request or push.