Bump javafx.version from 21.0.1 to 21.0.3

Bumps `javafx.version` from 21.0.1 to 21.0.3.

Updates `org.openjfx:javafx-fxml` from 21.0.1 to 21.0.3

Updates `org.openjfx:javafx-controls` from 21.0.1 to 21.0.3

Updates `org.openjfx:javafx-graphics` from 21.0.1 to 21.0.3

Updates `org.openjfx:javafx-base` from 21.0.1 to 21.0.3

---
updated-dependencies:
- dependency-name: org.openjfx:javafx-fxml
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.openjfx:javafx-controls
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.openjfx:javafx-graphics
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.openjfx:javafx-base
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -36,7 +36,7 @@
     <com.io7m.xstructural.version>1.8.0</com.io7m.xstructural.version>
     <io7m.api.previousVersion>0.0.2-SNAPSHOT</io7m.api.previousVersion>
     <io7m.java.targetJavaVersion>21</io7m.java.targetJavaVersion>
-    <javafx.version>21.0.1</javafx.version>
+    <javafx.version>21.0.3</javafx.version>
     <junit.version>5.10.2</junit.version>
   </properties>