Update dependency org.jfree:jfreechart to v1.5.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.jfree:jfreechart (source)	1.5.2 → 1.5.6

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Release Notes

jfree/jfreechart (org.jfree:jfreechart)

v1.5.6: JFreeChart 1.5.6

Version 1.5.6 (21 May 2025)

• added setSymbols method to SymbolAxis (#​421)
• added label padding to Crosshair (#​414)
• add clearSeriesXXX methods for all series settings in AbstractRenderer (#​364)
• fix calculating if label fits inside bar for XYBarRenderer (#​366)
• set default background paint to LIGHT_GRAY (#​324)
• deprecated all classes in org.jfree.chart.servlet.* (#​385)
• updated pom.xml with new Maven publishing flow and latest plugin versions
• various minor improvements

v1.5.5: JFreeChart 1.5.5

Version 1.5.5 (23 June 2024)

• added XYBezierRenderer by Javier Robes (#​286)
• fix cross-hair painting (#​340)
• parameter range check for CompassPlot (#​397)

Note: some (supposed) security vulnerabilities have been reported for v1.5.4:

• CVE-2023-52070 : an ArrayIndexOutOfBoundsException in CompassPlot
  No fix is considered necessary, however (#​397) has been applied.

• CVE-2024-22949 : a possible NullPointerException in CategoryLineAnnotation
  No fix is considered necessary.

• CVE-2024-23076 : a possible NullPointerException in BubbleXYItemLabelGenerator
  No fix is considered necessary.

v1.5.4: JFreeChart 1.5.4

Version 1.5.4 (8 January 2023)

• add new methods to access maps for datasets, renderers and axes in plots (#​201);
• add option to truncate item labels and compute contrast colors (PR #​225)
• add new annotations (PR #​226)
• add new panel for background rendering of charts (PR #​233)
• fix tick label font for LogAxis with number format override (#​98);
• added valueVisible flag to MeterPlot (#​231);
• added get/setWebFillAlpha() methods to SpiderWebPlot (#​279)
• add argument checks for annotations (#​223);
• removed JFreeChartResources.java file (#​239)

v1.5.3: JFreeChart 1.5.3

Version 1.5.3 (21 February 2021)

• add new FlowPlot class for drawing Sankey charts;
• throw exception in DefaultPieDataset for invalid index (#​212);
• fix isJFreeSVGAvailable() method (bug #​207);
• replaced some usages of ObjectUtils with the JDK Objects class;
• remove unused URLUtilities class;
• removed @since 1.0.x Javadoc tags since these do not provide useful information anymore.

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