build(deps): bump org.bitcoinj:bitcoinj-core from 0.16.3 to 0.16.4

Bumps [org.bitcoinj:bitcoinj-core](https://github.com/bitcoinj/bitcoinj) from 0.16.3 to 0.16.4.
- [Release notes](https://github.com/bitcoinj/bitcoinj/releases)
- [Commits](bitcoinj/bitcoinj@v0.16.3...v0.16.4)

---
updated-dependencies:
- dependency-name: org.bitcoinj:bitcoinj-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -56,7 +56,7 @@
         <dependency>
             <groupId>org.bitcoinj</groupId>
             <artifactId>bitcoinj-core</artifactId>
-            <version>0.16.3</version>
+            <version>0.16.4</version>
         </dependency>
         <!-- the protobuf-javalite version pulled by bitcoinj-core.0.16.2 contains a vulnerability -->
         <dependency>