PHP 8.2: Use standalone true types

[s2x]

Summary

• Change AlwaysRebootStrategy::shouldReboot() return type from bool to true
• Change DefaultResponseStrategy::supports() return type from bool to true

PHP 8.2 allows using standalone true/false/null as return types since they are subtypes of bool.

Changes

• Interfaces unchanged (still declare bool - correct)
• Only implementations that always return true now declare : true