Bump org.bouncycastle:bcpkix-jdk18on from 1.77 to 1.78.1

Bumps [org.bouncycastle:bcpkix-jdk18on](https://github.com/bcgit/bc-java) from 1.77 to 1.78.1.
- [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:bcpkix-jdk18on
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle.kts

@@ -55,7 +55,7 @@ allprojects {
       // https://docs.gradle.org/current/userguide/resolution_rules.html
       dependencySubstitution {
         substitute(module("org.bouncycastle:bcpkix-jdk15on"))
-            .using(module("org.bouncycastle:bcpkix-jdk18on:1.77"))
+            .using(module("org.bouncycastle:bcpkix-jdk18on:1.78.1"))
       }
     }
   }

client/build.gradle.kts

@@ -118,7 +118,7 @@ dependencies {
 
   implementation("org.apache.commons:commons-compress:1.26.1")
 
-  implementation("org.bouncycastle:bcpkix-jdk18on:1.77")
+  implementation("org.bouncycastle:bcpkix-jdk18on:1.78.1")
 
   testImplementation("de.gesellix:testutil:[2024-01-01T01-01-01,)")