Update README and workflows.

.github/workflows/main.linux.temurin.current.yml

@@ -14,7 +14,7 @@ jobs:
       - name: JDK
         uses: actions/setup-java@v3
         with:
-          java-version: 21
+          java-version: 22
           distribution: 'temurin'
       - name: Build
         run: mvn --errors clean verify site

.github/workflows/main.windows.temurin.current.yml

@@ -14,7 +14,7 @@ jobs:
       - name: JDK
         uses: actions/setup-java@v3
         with:
-          java-version: 21
+          java-version: 22
           distribution: 'temurin'
       - name: Build
         run: mvn --errors clean verify site

README.md

@@ -2,10 +2,10 @@ junsigned
 ===
 
 [![Maven Central](https://img.shields.io/maven-central/v/com.io7m.junsigned/com.io7m.junsigned.svg?style=flat-square)](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22com.io7m.junsigned%22)
-[![Maven Central (snapshot)](https://img.shields.io/nexus/s/https/s01.oss.sonatype.org/com.io7m.junsigned/com.io7m.junsigned.svg?style=flat-square)](https://s01.oss.sonatype.org/content/repositories/snapshots/com/io7m/junsigned/)
+[![Maven Central (snapshot)](https://img.shields.io/nexus/s/com.io7m.junsigned/com.io7m.junsigned?server=https%3A%2F%2Fs01.oss.sonatype.org&style=flat-square)](https://s01.oss.sonatype.org/content/repositories/snapshots/com/io7m/junsigned/)
 [![Codecov](https://img.shields.io/codecov/c/github/io7m/junsigned.svg?style=flat-square)](https://codecov.io/gh/io7m/junsigned)
 
-![junsigned](./src/site/resources/junsigned.jpg?raw=true)
+![com.io7m.junsigned](./src/site/resources/junsigned.jpg?raw=true)
 
 | JVM | Platform | Status |
 |-----|----------|--------|