test(deps): update actions/cache to v5 (cypress-io#1606)

Author: MikeMcC399

.github/workflows/example-install-only.yml

@@ -21,7 +21,7 @@ jobs:
       # (which is important when using ^ version in package.json)
       # see https://github.com/actions/cache
       - name: Cache npm and Cypress 📦
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ~/.cache/Cypress

README.md

@@ -1477,7 +1477,7 @@ If the project has many dependencies, but you want to install just Cypress you c
 
 ```yml
 - uses: actions/checkout@v6
-- uses: actions/cache@v4
+- uses: actions/cache@v5
   with:
     path: |
       ~/.cache/Cypress