Add guzzlehttp promises ^2.0.0 as alternate version #93

Job	Run time
build-source	18s
php-xdebug-docker (7.4, 3.1.5)	45s
php-xdebug-docker (8.0, 3.1.5)	45s
php-xdebug-docker (8.1, 3.1.5)	50s
php-xdebug-docker (8.2, 3.2.1)	1m 17s
confluent-integration (latest)	1m 5s
ci-checks (7.4, --prefer-lowest)	31s
confluent-integration (4.1.4)	39s
ci-checks (8.0, --prefer-lowest)	43s
confluent-integration (5.5.2)	50s
ci-checks (8.1, --prefer-lowest)	14s
ci-checks (8.2, --prefer-lowest)	28s
ci-checks (7.4, --prefer-stable)	25s
ci-checks (8.0, --prefer-stable)	17s
ci-checks (8.1, --prefer-stable)	25s
ci-checks (8.2, --prefer-stable)	23s
	9m 55s

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