Upgrade framework

vendor/symfony/mime/CHANGELOG.md

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+CHANGELOG
+=========
+
+6.0
+---
+
+ * Remove `Address::fromString()`, use `Address::create()` instead
+ * Remove `Serializable` interface from `RawMessage`
+
+5.2.0
+-----
+
+ * Add support for DKIM
+ * Deprecated `Address::fromString()`, use `Address::create()` instead
+
+4.4.0
+-----
+
+ * [BC BREAK] Removed `NamedAddress` (`Address` now supports a name)
+ * Added PHPUnit constraints
+ * Added `AbstractPart::asDebugString()`
+ * Added `Address::fromString()`
+
+4.3.3
+-----
+
+ * [BC BREAK] Renamed method `Headers::getAll()` to `Headers::all()`.
+
+4.3.0
+-----
+
+ * Introduced the component as experimental