chore(deps): Bump blinklabs-io/mithril-client from 0.12.38-1 to 0.13.9-1 (#350)

Bumps [blinklabs-io/mithril-client](https://github.com/blinklabs-io/docker-mithril-client) from 0.12.38-1 to 0.13.9-1.
- [Release notes](https://github.com/blinklabs-io/docker-mithril-client/releases)
- [Commits](blinklabs-io/docker-mithril-client@v0.12.38-1...v0.13.9-1)

---
updated-dependencies:
- dependency-name: blinklabs-io/mithril-client
  dependency-version: 0.13.9-1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Dockerfile

@@ -23,7 +23,7 @@ RUN echo "Building tags/${NODE_VERSION}..." \
 
 FROM ghcr.io/blinklabs-io/cardano-cli:10.15.1.0-1 AS cardano-cli
 FROM ghcr.io/blinklabs-io/cardano-configs:20260430-1 AS cardano-configs
-FROM ghcr.io/blinklabs-io/mithril-client:0.12.38-1 AS mithril-client
+FROM ghcr.io/blinklabs-io/mithril-client:0.13.9-1 AS mithril-client
 FROM ghcr.io/blinklabs-io/mithril-signer:1.0.0-1 AS mithril-signer
 FROM ghcr.io/blinklabs-io/nview:0.13.0 AS nview
 FROM ghcr.io/blinklabs-io/txtop:0.15.0 AS txtop