minor #40455 [Mailer] fix lowest allowed dependencies (xabbuh)

This PR was merged into the 4.4 branch.

Discussion
----------

[Mailer] fix lowest allowed dependencies

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       |
| License       | MIT
| Doc PR        |

Commits
-------

e9f2ef211e [Mailer] fix lowest allowed dependencies

src/Symfony/Component/Mailer/Bridge/Amazon/composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=7.1.3",
-        "symfony/mailer": "^4.4|^5.0"
+        "symfony/mailer": "^4.4.21|^5.2.6"
     },
     "require-dev": {
         "symfony/http-client": "^4.3|^5.0"

src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=7.1.3",
-        "symfony/mailer": "^4.4|^5.0"
+        "symfony/mailer": "^4.4.21|^5.2.6"
     },
     "require-dev": {
         "symfony/http-client": "^4.3|^5.0"

src/Symfony/Component/Mailer/Bridge/Postmark/composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=7.1.3",
-        "symfony/mailer": "^4.4|^5.0"
+        "symfony/mailer": "^4.4.21|^5.2.6"
     },
     "require-dev": {
         "symfony/http-client": "^4.3|^5.0"

src/Symfony/Component/Mailer/composer.json

@@ -20,7 +20,7 @@
         "egulias/email-validator": "^2.1.10|^3",
         "psr/log": "~1.0",
         "symfony/event-dispatcher": "^4.3",
-        "symfony/mime": "^4.4|^5.0",
+        "symfony/mime": "^4.4.21|^5.2.6",
         "symfony/service-contracts": "^1.1|^2"
     },
     "require-dev": {