Update JUnit to 5.8 (#594 / #612)

The temporary directory/resource extension proposed in #348 / #491
requires parameter-level extension registration, which was added in
JUnit Jupiter 5.8.0[1].

[1]: https://junit.org/junit5/docs/5.8.0/release-notes/index.html

Closes: #594
PR: #612

.github/workflows/build.yml

@@ -98,7 +98,7 @@ jobs:
     strategy:
       matrix:
         java: [ 11, 17 ]
-        junit-version: [ '5.7.2', '5.8.2' ]
+        junit-version: [ '5.8.2' ]
         modular: [true, false]
         os: [ubuntu, macos, windows]
     name: with Java ${{ matrix.java }}, JUnit ${{ matrix.junit-version }}, Modular ${{ matrix.modular }} on ${{ matrix.os }}
@@ -127,7 +127,7 @@ jobs:
     timeout-minutes: 15
     strategy:
       matrix:
-        junit-version: [ '5.7.2', '5.8.1' ]
+        junit-version: [ '5.8.2' ]
         modular: [true, false]
         os: [ubuntu, macos, windows]
     name: Experimental build with newest JDK early-access build and Gradle release candidate

gradle.properties

@@ -1,4 +1,4 @@
-junitVersion=5.7.2
+junitVersion=5.8.2
 
 # Ensure sufficient heap size, especially for Sonar.
 org.gradle.jvmargs=-Xmx8g