chore(deps): update halfshot/matrix-hookshot docker tag to v7.3.0

[small-hack-renovate]

This PR contains the following updates:

Package	Update	Change
halfshot/matrix-hookshot	minor	7.2.0 → 7.3.0

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Release Notes

matrix-org/matrix-hookshot (halfshot/matrix-hookshot)

v7.3.0

Compare Source

Features

• Add an optional template argument to the feed command, to allow specifying a template for feed entries when using the command interface. (#​1097)
• Static connections may now be configured in the config file. (#​1102)
• Prefixes are now supported on listeners. You may specify a prefix under any listener config entry. (#​1119)

Bugfixes

• Fix a case where outbound webhooks would not work if you had not enabled openproject (due to a mixed up config check). (#​1095)
• Fix /oauth responding with 405 despite GitHub being configured. (#​1105)
• Ensure running Hookshot with a missing or empty user namespace in the registration file. (#​1116)

Internal Changes

• Update matrix-bot-sdk / matrix-appservice-bridge to latest versions. (#​1120)

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