Update actions/checkout action to v6 #101

Job	Run time
Build Docker image (linux/amd64, 8.1, pcntl xdebug zip intl bcmath rdkafka pdo_pgsql pdo_mysql gd...	1m 6s
Build Docker image (linux/amd64, 8.4, pcntl xdebug zip intl bcmath rdkafka pdo_pgsql pdo_mysql gd...	1m 1s
Build Docker image (linux/amd64, 8.2, pcntl xdebug zip intl bcmath rdkafka pdo_pgsql pdo_mysql gd...	59s
Build Docker image (linux/amd64, 8.3, pcntl xdebug zip intl bcmath rdkafka pdo_pgsql pdo_mysql gd...	1m 0s
Build Docker image (linux/amd64, 8.5-rc, pcntl xdebug zip intl bcmath rdkafka pdo_pgsql pdo_mysql...	56s
Build Docker image (linux/arm64, 8.2, pcntl xdebug zip intl bcmath rdkafka pdo_pgsql pdo_mysql gd...	58s
Build Docker image (linux/arm64, 8.1, pcntl xdebug zip intl bcmath rdkafka pdo_pgsql pdo_mysql gd...	57s
Build Docker image (linux/arm64, 8.3, pcntl xdebug zip intl bcmath rdkafka pdo_pgsql pdo_mysql gd...	1m 1s
Build Docker image (linux/arm64, 8.4, pcntl xdebug zip intl bcmath rdkafka pdo_pgsql pdo_mysql gd...	58s
Build Docker image (linux/arm64, 8.5-rc, pcntl xdebug zip intl bcmath rdkafka pdo_pgsql pdo_mysql...	57s
	9m 53s

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