build(deps): bump blinklabs-io/mithril-client

Bumps [blinklabs-io/mithril-client](https://github.com/blinklabs-io/docker-mithril-client) from 0.12.11-1 to 0.12.30-1.
- [Release notes](https://github.com/blinklabs-io/docker-mithril-client/releases)
- [Commits](blinklabs-io/docker-mithril-client@v0.12.11-1...v0.12.30-1)

---
updated-dependencies:
- dependency-name: blinklabs-io/mithril-client
  dependency-version: 0.12.30-1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Dockerfile

@@ -10,7 +10,7 @@ RUN --mount=type=cache,target=/gomod-cache --mount=type=cache,target=/go-cache m
 
 FROM ghcr.io/blinklabs-io/cardano-cli:10.11.1.0-1 AS cardano-cli
 FROM ghcr.io/blinklabs-io/cardano-configs:20250917-1 AS cardano-configs
-FROM ghcr.io/blinklabs-io/mithril-client:0.12.11-1 AS mithril-client
+FROM ghcr.io/blinklabs-io/mithril-client:0.12.30-1 AS mithril-client
 FROM ghcr.io/blinklabs-io/txtop:0.13.0 AS txtop
 
 FROM debian:bookworm-slim AS dingo