fix: remove unused psr/cache from bigtable: (#1276)
fix: remove unused psr/cache from bigtable: (#1276)


GoogleCloudPlatform/php-docs-samples,GoogleCloudPlatform/php-docs-samples,GoogleCloudPlatform/php-docs-samples,GoogleCloudPlatform/php-docs-samples,GoogleCloudPlatform/php-docs-samples