update minie to 7.8.1 (#549)

* update minie to 7.8.1

build.gradle

@@ -41,7 +41,7 @@ dependencies {
     corelibs dep("org.jmonkeyengine:jme3-awt-dialogs:$jmeVersion-$jmeVersionTag", true, true)
     corelibs dep("org.jmonkeyengine:jme3-lwjgl:$jmeVersion-$jmeVersionTag", true, true)
     corelibs dep("org.jmonkeyengine:jme3-effects:$jmeVersion-$jmeVersionTag", true, true)
-    corelibs dep("com.github.stephengold:Minie:7.7.0", false, false) // replacement for bullet-native
+    corelibs dep("com.github.stephengold:Minie:7.8.1", false, false) // replacement for bullet-native
     corelibs dep("com.github.stephengold:Heart:8.7.0", true, true) // requirement for Minie
     corelibs dep(fileTree("lib"), false, false)
     corelibs dep("org.jmonkeyengine:jme3-jogg:$jmeVersion-$jmeVersionTag", true, true)