adding in fixes for tests that showed up when I tried to run tests with Swift 6.1

Author: heckj

Sources/Lindenmayer/Examples/Examples3D.swift

@@ -422,16 +422,16 @@ public enum Examples3D: Sendable {
             let upper: Float = 45.0
             let lower: Float = 15.0
 
-            if rng.p(0.5) {
+            if await rng.p(0.5) {
                 return [
                     StaticStem2(length: 2),
-                    Modules.PitchDown(angle: Angle(degrees: Double(rng.randomFloat(in: lower ... upper)))),
+                    Modules.PitchDown(angle: Angle(degrees: Double(await rng.randomFloat(in: lower ... upper)))),
                     Stem2(length: stem.length),
                 ]
             } else {
                 return [
                     StaticStem2(length: 2),
-                    Modules.PitchUp(angle: Angle(degrees: Double(rng.randomFloat(in: lower ... upper)))),
+                    Modules.PitchUp(angle: Angle(degrees: Double(await rng.randomFloat(in: lower ... upper)))),
                     Stem2(length: stem.length),
                 ]
             }

docbuild.bash

@@ -37,7 +37,7 @@ export DOCC_JSON_PRETTYPRINT=YES
      --allow-writing-to-directory ./docs \
      generate-documentation \
      --fallback-bundle-identifier com.github.heckj.Lindenmayer \
-     --fallback-bundle-version 0.7.2 \
+     --fallback-bundle-version 0.7.3 \
      --target Lindenmayer \
      --target LindenmayerViews \
      --output-path ./docs \