chore: Minor updates:

- Update to latest Scalatestplus version embedded in the artifact ID, which Scala Steward is unable to recognize
- Adding JDK21 support to the build actions
- Adding a small maintenance section to the readme describing the process used for maintaining CI jobs and cutting a release

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         scala: [2.12.20]
-        java: [zulu@8, temurin@11, temurin@17]
+        java: [zulu@8, temurin@11, temurin@17, temurin@21]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
@@ -56,6 +56,14 @@ jobs:
           java-version: 17
           cache: sbt
 
+      - name: Setup Java (temurin@21)
+        if: matrix.java == 'temurin@21'
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+          cache: sbt
+
       - name: Setup sbt
         uses: sbt/setup-sbt@v1
 
@@ -113,6 +121,14 @@ jobs:
           java-version: 17
           cache: sbt
 
+      - name: Setup Java (temurin@21)
+        if: matrix.java == 'temurin@21'
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+          cache: sbt
+
       - name: Setup sbt
         uses: sbt/setup-sbt@v1
 

README.md

@@ -70,6 +70,22 @@ _Note_:  By default these patterns are applied _in addition_ to the default patt
 conventionalPatternsAdditive := false
 ```
 
-# License
+## Maintenance
+
+### CI
+This project uses the [sbt-ci-release](https://github.com/sbt/sbt-ci-release) for generating GitHub actions in the `.github` actions directory, based on declared build configuration in `github-actions.sbt`. 
+
+When making changes to `github-actions.sbt` job declarations, the Github actions should be updated to reflect these changes by running the following task:
+
+```
+sbt githubWorkflowGenerate
+```
+
+### Releasing
+
+To release a new version of this plugin simply create a new tag against the intended release commit which should trigger the `release` Gitbhub action. 
+
+
+## License
 
 This software is under the [Apache 2.0 License](http://www.apache.org/licenses/LICENSE-2.0.html).

build.sbt

@@ -4,7 +4,7 @@ libraryDependencies ++= Seq(
   "com.vdurmont"       % "semver4j"        % "3.1.0",
   "org.scalatest"     %% "scalatest"       % "3.2.19"   % Test,
   "org.scalacheck"    %% "scalacheck"      % "1.18.1"   % Test,
-  "org.scalatestplus" %% "scalacheck-1-16" % "3.2.14.0" % Test
+  "org.scalatestplus" %% "scalacheck-1-18" % "3.2.19.0" % Test
 )
 
 // sbt plugin dependencies

github-actions.sbt

@@ -1,6 +1,6 @@
 inThisBuild(
   Seq(
-    githubWorkflowJavaVersions ++= Seq(JavaSpec.temurin("11"), JavaSpec.temurin("17")),
+    githubWorkflowJavaVersions ++= Seq(JavaSpec.temurin("11"), JavaSpec.temurin("17"), JavaSpec.temurin("21")),
     githubWorkflowBuild := Seq(WorkflowStep.Sbt(List("test", "scripted"))),
     githubWorkflowTargetTags ++= Seq("v*"),
     githubWorkflowPublishTargetBranches += RefPredicate.StartsWith(Ref.Tag("v")),