fix(deps): update flexmark to v0.64.8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	OpenSSF
com.vladsch.flexmark:flexmark-util-format	dependencies	patch	0.64.0 -> 0.64.8
com.vladsch.flexmark:flexmark-util-sequence	dependencies	patch	0.64.0 -> 0.64.8
com.vladsch.flexmark:flexmark-util-ast	dependencies	patch	0.64.0 -> 0.64.8
com.vladsch.flexmark:flexmark-util-misc	dependencies	patch	0.64.0 -> 0.64.8
com.vladsch.flexmark:flexmark-util-data	dependencies	patch	0.64.0 -> 0.64.8
com.vladsch.flexmark:flexmark-util	dependencies	patch	0.64.0 -> 0.64.8
com.vladsch.flexmark:flexmark-profile-pegdown	dependencies	patch	0.64.0 -> 0.64.8
com.vladsch.flexmark:flexmark	dependencies	patch	0.64.0 -> 0.64.8

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Release Notes

vsch/flexmark-java (com.vladsch.flexmark:flexmark-util-format)

v0.64.6

Compare Source

v0.64.4

Compare Source

v0.64.2

Compare Source

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