fix: Gradle 9.x compatibility - add junit-platform-launcher and fix encoding

- Add testRuntimeOnly 'org.junit.platform:junit-platform-launcher' to all
  modules (required since Gradle 9.x no longer auto-provides it)
- Fix encoding issue in PythonEmbedPoolTest.java (em dash -> ASCII)
- Update python-embed-build-common to maven.publish 0.37.0 (missed by Dependabot)

Author: white

python-embed-build-common/build.gradle

@@ -1,7 +1,7 @@
 plugins {
     id 'java-library'
     id 'jacoco'
-    id 'com.vanniktech.maven.publish' version '0.34.0'
+    id 'com.vanniktech.maven.publish' version '0.37.0'
 }
 
 group = 'io.github.howtis'
@@ -49,6 +49,7 @@ repositories {
 dependencies {
     testImplementation platform('org.junit:junit-bom:5.11.4')
     testImplementation 'org.junit.jupiter:junit-jupiter'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 }
 
 tasks.named('jar') {

python-embed-gradle-plugin/build.gradle

@@ -43,6 +43,7 @@ dependencies {
 
     testImplementation platform('org.junit:junit-bom:5.11.4')
     testImplementation 'org.junit.jupiter:junit-jupiter'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 }
 
 tasks.named('jar') {

python-embed-maven-plugin/build.gradle

@@ -54,6 +54,7 @@ dependencies {
 
     testImplementation platform('org.junit:junit-bom:5.11.4')
     testImplementation 'org.junit.jupiter:junit-jupiter'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
     testImplementation 'org.apache.maven:maven-compat:3.9.9'
     testImplementation 'org.apache.maven.plugin-testing:maven-plugin-testing-harness:3.3.0'
     testImplementation 'org.mockito:mockito-core:5.15.2'

python-embed-runtime/build.gradle

@@ -10,6 +10,7 @@ dependencies {
 
     testImplementation platform('org.junit:junit-bom:5.11.4')
     testImplementation 'org.junit.jupiter:junit-jupiter'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
     testImplementation 'org.slf4j:slf4j-simple:2.0.16'
 }
 

python-embed-runtime/src/test/java/io/github/howtis/pythonembed/PythonEmbedPoolTest.java

@@ -1367,11 +1367,11 @@ void ref_handleSurvivesIdleCleanup() throws Exception {
                 dynPool.exec("sv = 'survive'").get(3, TimeUnit.SECONDS);
             }
 
-            // Create a handle — this should pin its owning instance
+            // Create a handle -- this should pin its owning instance
             PythonHandle handle = dynPool.ref("sv").get(3, TimeUnit.SECONDS);
             assertNotNull(handle);
 
-            // Run idle cleanup — handle's instance should survive
+            // Run idle cleanup -- handle's instance should survive
             dynPool.runMaintenance();
 
             // The handle should still be usable (not invalidated by cleanup)

python-embed-spring-boot-starter/build.gradle

@@ -21,4 +21,5 @@ dependencies {
 
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testImplementation 'org.springframework.boot:spring-boot-starter-actuator'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 }