TYPO3 Core v10 should rely on Symfony 4.4 (LTS release)
and add support for 5.0 automatically.

Symfony 4.4 made breaking changes to the Mailer and Mime components
which now need adaptions.

Used composer command:

composer req "symfony/config":"^4.4 || ^5.0" \
"symfony/console":"^4.4 || ^5.0" \
"symfony/dependency-injection":"^4.4 || ^5.0" \
"symfony/expression-language":"^4.4 || ^5.0" \
"symfony/finder":"^4.4 || ^5.0" \
"symfony/mailer":"^4.4 || ^5.0" \
"symfony/mime":"^4.4 || ^5.0" \
"symfony/property-access":"^4.4 || ^5.0" \
"symfony/property-info":"^4.4 || ^5.0" \
"symfony/routing":"^4.4 || ^5.0" \
"symfony/yaml":"^4.4 || ^5.0" --update-with-all-dependencies

Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 0 installs, 27 updates, 0 removals
  - Updating symfony/polyfill-ctype (v1.11.0 => v1.12.0)
  - Updating symfony/filesystem (v4.3.1 => v4.4.0)
  - Updating symfony/config (v4.3.2 => v4.4.0)
  - Updating symfony/service-contracts (v1.1.2 => v1.1.8)
  - Updating symfony/polyfill-php73 (v1.11.0 => v1.12.0)
  - Updating symfony/polyfill-mbstring (v1.11.0 => v1.12.0)
  - Updating symfony/console (v4.3.1 => v4.4.0)
  - Updating symfony/dependency-injection (v4.3.2 => v4.4.0)
  - Updating symfony/var-exporter (v4.3.1 => v4.4.0)
  - Updating symfony/cache-contracts (v1.1.1 => v1.1.7)
  - Updating psr/log (1.0.2 => 1.1.2)
  - Updating symfony/cache (v4.3.1 => v4.4.0)
  - Updating symfony/expression-language (v4.3.1 => v4.4.0)
  - Updating symfony/finder (v4.3.3 => v4.4.0)
  - Updating symfony/polyfill-php72 (v1.11.0 => v1.12.0)
  - Updating symfony/polyfill-intl-idn (v1.11.0 => v1.12.0)
  - Updating symfony/mime (v4.3.2 => v4.4.0)
  - Updating symfony/event-dispatcher-contracts (v1.1.1 => v1.1.7)
  - Updating symfony/event-dispatcher (v4.3.1 => v4.4.0)
  - Updating doctrine/lexer (v1.0.1 => 1.2.0)
  - Updating egulias/email-validator (2.1.9 => 2.1.11)
  - Updating symfony/mailer (v4.3.2 => v4.4.0)
  - Updating symfony/inflector (v4.3.1 => v4.4.0)
  - Updating symfony/property-access (v4.3.1 => v4.4.0)
  - Updating symfony/property-info (v4.3.1 => v4.4.0)
  - Updating symfony/routing (v4.3.1 => v4.4.0)
  - Updating symfony/yaml (v4.3.1 => v4.4.0)

Resolves: #89721
Releases: master
Change-Id: I834a79e3880b3a7a95429c2fe052657e21599ec7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62354


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Benni Mack <benni@typo3.org>