Upgrade to bcprov-jdk18on 1.78.1

Closes gh-40621

Author: mhalbritter

spring-boot-project/spring-boot-tools/spring-boot-loader/build.gradle

@@ -18,6 +18,6 @@ dependencies {
 	testImplementation("org.springframework:spring-core-test")
 
 	testRuntimeOnly("ch.qos.logback:logback-classic")
-	testRuntimeOnly("org.bouncycastle:bcprov-jdk18on:1.71")
+	testRuntimeOnly("org.bouncycastle:bcprov-jdk18on:1.78.1")
 	testRuntimeOnly("org.springframework:spring-webmvc")
-}
+}