[Cache] deprecate all PSR-16 adapters, provide Psr16Cache instead

Author: nicolas-grekas

CHANGELOG.md

@@ -8,6 +8,7 @@ CHANGELOG
    be mandatory in 5.0.
  * Added `ControllerTrait::isFormValid()`
  * Added an `help_html` form option to display the `help` text as HTML
+ * Deprecated the "Psr\SimpleCache\CacheInterface" / "cache.app.simple" service, use "Symfony\Contracts\Cache\CacheInterface" / "cache.app" instead
 
  * [BC Break] When using Messenger, the default transport changed from
    using Symfony's serializer service to use `PhpSerializer`, which uses

Resources/config/cache.xml

@@ -11,7 +11,8 @@
             <tag name="cache.pool" clearer="cache.app_clearer" reset="reset" />
         </service>
 
-        <service id="cache.app.simple" class="Symfony\Component\Cache\Simple\Psr6Cache">
+        <service id="cache.app.simple" class="Symfony\Component\Cache\Psr16Cache">
+            <deprecated>The "Psr\SimpleCache\CacheInterface" / "%service_id%" service is deprecated since Symfony 4.3. Use "Symfony\Contracts\Cache\CacheInterface" / "cache.app" instead.</deprecated>
             <argument type="service" id="cache.app" />
         </service>
 

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "php": "^7.1.3",
         "ext-xml": "*",
-        "symfony/cache": "~4.2",
+        "symfony/cache": "~4.3",
         "symfony/config": "~4.2",
         "symfony/contracts": "^1.0.2",
         "symfony/dependency-injection": "^4.2",