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Note behavior change of RenderSVG._make_id to SHA512#18192

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	`1`	`+ID attribute of XML tags in SVG files now based on SHA512 rather than MD5`
	`2`	`+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
	`3`	`+`
	`4`	+The `RenderSVG._make_id` method generates unique ID attributes for various
	`5`	`+XML tags in SVG files. This method previously used the first 10 characters of`
	`6`	+an MD5 hash. The `hashlib.md5` constructor is not available in Python on
	`7`	`+systems with Federal Information Processing Standards (FIPS) enabled.`
	`8`	+`RenderSVG._make_id` now uses the first 10 characters of an SHA512 hash. The
	`9`	`+general behavior of this method remains unchanged, though SVG files that`
	`10`	`+would otherwise those saved with earlier versions of matplotlib, will have`
	`11`	`+different ID attributes.`

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