chore: Fix JSON format for release-please-config.json #136

Job	Run time
PHP 7.4 \| WP 5.5 \| prefer-stable	3m 51s
PHP 7.4 \| WP 5.5 (MS) \| prefer-stable	3m 55s
PHP 7.4 \| WP latest \| prefer-stable	4m 4s
PHP 7.4 \| WP latest (MS) \| prefer-stable	4m 8s
PHP 7.4 \| WP trunk \| prefer-stable	3m 53s
PHP 8.1 \| WP trunk \| prefer-stable	3m 58s
PHP 8.0 \| WP latest \| prefer-stable	3m 48s
PHP 8.1 \| WP latest \| prefer-stable	3m 53s
PHP 7.4 (Imagick) \| WP latest \| prefer-stable	4m 3s
PHP 7.4 (with coverage) \| WP latest \| prefer-stable	3m 51s
	39m 24s

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