chore(deps): update pact-broker image to 2.123.0-pactbroker2.112.0

[YOU54F]

updates to https://github.com/pact-foundation/pact-broker-docker/releases/tag/2.123.0-pactbroker2.112.0

which additionally provides multi-manifest builds

changelog

[ChrisJBurns]

Thanks @YOU54F I want to try and get renovate working so that updates to the base image are automatic per #67 but I think due to the non-semantic versioning of the pact broker image, its a tricky one and would require some regex logic i think

[z0rc]

@ChrisJBurns renovate versioning loose (https://docs.renovatebot.com/modules/versioning/loose/) works just fine for pact-broker image, no need for regex. But keep in mind that renovate lacks support of bumping chart version in MRs renovatebot/renovate#28861.