minor #30802 [Messenger] Add psr/cache on Messenger's dependencies (sroze)

This PR was merged into the 4.3-dev branch.

Discussion
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[Messenger] Add `psr/cache` on Messenger's dependencies

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #30754
| License       | MIT
| Doc PR        | ø

Commits
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0b5004f59f Add `psr/cache` on Messenger's dependencies

Author: fabpot

composer.json

@@ -21,6 +21,7 @@
     },
     "require-dev": {
         "doctrine/dbal": "~2.4",
+        "psr/cache": "~1.0",
         "symfony/console": "~3.4|~4.0",
         "symfony/dependency-injection": "~3.4.19|^4.1.8",
         "symfony/doctrine-bridge": "~3.4|~4.0",