minor #16165 [FrameworkBundle] composer suggest fix (Miliooo)

This PR was merged into the 2.8 branch.

Discussion
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[FrameworkBundle] composer suggest fix

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | no
Since cache is now required (See https://github.com/symfony/symfony/pull/16159), it makes no sense to suggest it

Commits
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9786868 [FrameworkBundle] composer suggest fix

src/Symfony/Bundle/FrameworkBundle/composer.json

@@ -55,8 +55,7 @@
         "symfony/form": "For using forms",
         "symfony/serializer": "For using the serializer service",
         "symfony/validator": "For using validation",
-        "symfony/yaml": "For using the debug:config and lint:yaml commands",
-        "doctrine/cache": "For using alternative cache drivers"
+        "symfony/yaml": "For using the debug:config and lint:yaml commands"
     },
     "autoload": {
         "psr-4": { "Symfony\\Bundle\\FrameworkBundle\\": "" }