Merge release 2.8.3 into 2.9.x

[github-actions]

Release Notes for 2.8.3

2.8.x bugfix release (patch)

2.8.3

• Total issues resolved: 4

• Total pull requests resolved: 10

• Total contributors: 12

• 8575: Exception when calling toIterable without parameters thanks to @flack

• 8533: Add test coverage for passing optimistic lock version as string thanks to @acoulton

• 8507: Address move away from master thanks to @greg0ire

• 8384: [GH-6394] Bugfix: IdentifierFlattener support for association non-object values. thanks to @beberlei and @tobiasstadler

Bug

• 8564: Adding DIR to include statement to fix issue with pathing thanks to @cybercitizen7
• 8508: Proposed fix for #8499 thanks to @diego-ninja
• 8495: Fix bug when using Result Cache with Query::toIterable thanks to @Warxcell
• 8493: Relax assertion thanks to @greg0ire and @martinolmr
• 8483: Fix single scalar hydrator memory leak on exception thanks to @olsavmic
• 8453: Fixes parenthesis when \n is involved thanks to @Warxcell

BC Break,Bug

• 8503: Incompatibility between getArrayResult() new type hint and use of indexBy() thanks to @benjamintoussaint

Improvement,Missing Tests

• 7315: Fix memory leak in AbstractHydrator thanks to @zlikavac32