Release v0.4.0-beta.12

What's Changed

• chore(extensions): pin the Avro and OpenAPI bundles from finos/morphir-extensions by @DamianReeves in #1120
• docs(mep): state the host-conversion rules for generateModel by @DamianReeves in #1117
• chore(extensions): pin morphir-openapi 0.4.0 by @DamianReeves in #1124
• build: upgrade MoonBit to 0.10.18 by @DamianReeves in #1125
• fix(mck): move the MoonBit MEP kit case to moonbit-model-stable-v1 by @DamianReeves in #1127
• feat(cli)!: remove the built-in Gleam provider and the gleam subcommand by @DamianReeves in #1123
• feat(mck): add a generic JSON Library profile to the MEP guest kit by @DamianReeves in #1129
• chore(extensions): pin the MEP 0.2 extension releases by @DamianReeves in #1130
• chore: prepare v0.4.0-beta.12 release by @DamianReeves in #1131

Full Changelog: v0.4.0-beta.11...v0.4.0-beta.12