fix(command): Make method compatible with upstream class (backportable)

Signed-off-by: Joas Schilling <coding@schilljs.com>

core/Command/Base.php

@@ -149,7 +149,7 @@ class Base extends Command implements CompletionAwareInterface {
 		$this->interrupted = true;
 	}
 
-	public function run(InputInterface $input, OutputInterface $output) {
+	public function run(InputInterface $input, OutputInterface $output): int {
 		// check if the php pcntl_signal functions are accessible
 		$this->php_pcntl_signal = function_exists('pcntl_signal');
 		if ($this->php_pcntl_signal) {

lib/private/Console/TimestampFormatter.php

@@ -41,7 +41,7 @@ class TimestampFormatter implements OutputFormatterInterface {
 	 *
 	 * @return bool true if the output will decorate messages, false otherwise
 	 */
-	public function isDecorated() {
+	public function isDecorated(): bool {
 		return $this->formatter->isDecorated();
 	}
 
@@ -61,7 +61,7 @@ class TimestampFormatter implements OutputFormatterInterface {
 	 * @param string $name
 	 * @return bool
 	 */
-	public function hasStyle($name) {
+	public function hasStyle($name): bool {
 		return $this->formatter->hasStyle($name);
 	}
 
@@ -72,7 +72,7 @@ class TimestampFormatter implements OutputFormatterInterface {
 	 * @return OutputFormatterStyleInterface
 	 * @throws \InvalidArgumentException When style isn't defined
 	 */
-	public function getStyle($name) {
+	public function getStyle($name): OutputFormatterStyleInterface {
 		return $this->formatter->getStyle($name);
 	}