build(deps): bump pdfboxVersion from 3.0.5 to 3.0.6 (Stirling-Tools#4713)

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Bumps `pdfboxVersion` from 3.0.5 to 3.0.6.
Updates `org.apache.pdfbox:preflight` from 3.0.5 to 3.0.6

Updates `org.apache.pdfbox:xmpbox` from 3.0.5 to 3.0.6

Updates `org.apache.pdfbox:pdfbox` from 3.0.5 to 3.0.6


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build.gradle

@@ -22,7 +22,7 @@ import java.time.Year
 
 ext {
     springBootVersion = "3.5.6"
-    pdfboxVersion = "3.0.5"
+    pdfboxVersion = "3.0.6"
     imageioVersion = "3.12.0"
     lombokVersion = "1.18.42"
     bouncycastleVersion = "1.82"