Bump org.bouncycastle:bcprov-jdk15to18 from 1.67 to 1.78

Bumps [org.bouncycastle:bcprov-jdk15to18](https://github.com/bcgit/bc-java) from 1.67 to 1.78.
- [Changelog](https://github.com/bcgit/bc-java/blob/main/docs/releasenotes.html)
- [Commits](https://github.com/bcgit/bc-java/commits)

---
updated-dependencies:
- dependency-name: org.bouncycastle:bcprov-jdk15to18
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -63,7 +63,7 @@
  <version.maven.model>3.3.9</version.maven.model>
  <version.jslack>1.1.4</version.jslack>
  <version.org.xhtmlrenderer>9.1.15</version.org.xhtmlrenderer>
- <version.bouncycastle>1.67</version.bouncycastle>
+ <version.bouncycastle>1.78</version.bouncycastle>
  <version.xmlsec>1.5.1</version.xmlsec>
  <version.google.guava>${version.com.google.guava}</version.google.guava>
  <version.riot.api>4.1.0</version.riot.api>