Flow bugfix releases: 8.3.10

[lubitz (Denny Lubitz)]

I tagged bugfix releases for Flow.
Thanks to all the contributors who helped with this release <3

• Denny Lubitz
• Christian Müller
• Marc Henry Schultz
• Karsten Dambekalns
• Christoph Lehmann
• Jon Uhlmann

The following fixes are included in the new version 8.3.10:

• BUGFIX: DateTime translation for validator
• BUGFIX: Avoid insecure composer/composer versions
• BUGFIX: First exception cannot be written in subcontext when booting
• BUGFIX: ReflectionService must always initialize
• TASK: Update “egulias/email-validator” version constraints

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See also Flow - 8.3.10 ChangeLogs