v4.6.4 release updates

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

.github/releases/v4.6.4.md

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+Warewulf v4.6.4 is a regularly-scheduled minor release in the v4.6.x series.
+
+- EL10 support
+- improved dnsmasq support
+- enhancements to `wwclient`
+- `wwctl configure warewulfd`
+- fixes for NetworkManager and ifcfg overlays
+- fixed unsetting boolean options with `wwctl`
+
+Significant changes are detailed in the [release
+notes](https://warewulf.org/docs/v4.6.x/release/v4.6.4.html). Additional changes
+may be listed in the
+[CHANGELOG](https://github.com/warewulf/warewulf/blob/main/CHANGELOG.md).