minor #14520 [2.7] link to https://symfony.com where possible (xabbuh)

This PR was merged into the 2.7 branch.

Discussion
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[2.7] link to https://symfony.com where possible

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

2.7-related changes of #14518.

Commits
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cc06163 [2.7] link to https://symfony.com where possible

src/Symfony/Bridge/PhpUnit/composer.json

@@ -3,7 +3,7 @@
     "type": "symfony-bridge",
     "description": "Symfony PHPUnit Bridge",
     "keywords": [],
-    "homepage": "http://symfony.com",
+    "homepage": "https://symfony.com",
     "license": "MIT",
     "authors": [
         {
@@ -12,7 +12,7 @@
         },
         {
             "name": "Symfony Community",
-            "homepage": "http://symfony.com/contributors"
+            "homepage": "https://symfony.com/contributors"
         }
     ],
     "require": {