Fix "Method *::evaluate() never returns null so it can be removed from the return type"

Author: staabm

src/Framework/Constraint/Equality/IsEqual.php

@@ -42,7 +42,7 @@ public function __construct(mixed $value)
      *
      * @throws ExpectationFailedException
      */
-    public function evaluate(mixed $other, string $description = '', bool $returnResult = false): ?bool
+    public function evaluate(mixed $other, string $description = '', bool $returnResult = false): bool
     {
         // If $this->value and $other are identical, they are also equal.
         // This is the most common path and will allow us to skip

src/Framework/Constraint/Equality/IsEqualCanonicalizing.php

@@ -42,7 +42,7 @@ public function __construct(mixed $value)
      *
      * @throws ExpectationFailedException
      */
-    public function evaluate(mixed $other, string $description = '', bool $returnResult = false): ?bool
+    public function evaluate(mixed $other, string $description = '', bool $returnResult = false): bool
     {
         // If $this->value and $other are identical, they are also equal.
         // This is the most common path and will allow us to skip

src/Framework/Constraint/Equality/IsEqualIgnoringCase.php

@@ -42,7 +42,7 @@ public function __construct(mixed $value)
      *
      * @throws ExpectationFailedException
      */
-    public function evaluate(mixed $other, string $description = '', bool $returnResult = false): ?bool
+    public function evaluate(mixed $other, string $description = '', bool $returnResult = false): bool
     {
         // If $this->value and $other are identical, they are also equal.
         // This is the most common path and will allow us to skip

src/Framework/Constraint/Equality/IsEqualWithDelta.php

@@ -42,7 +42,7 @@ public function __construct(mixed $value, float $delta)
      *
      * @throws ExpectationFailedException
      */
-    public function evaluate(mixed $other, string $description = '', bool $returnResult = false): ?bool
+    public function evaluate(mixed $other, string $description = '', bool $returnResult = false): bool
     {
         // If $this->value and $other are identical, they are also equal.
         // This is the most common path and will allow us to skip