Update 1.6.3 -> 1.6.4 (#154)

### Changelog
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UI/UX, performance, etc) that could appear in a changelog. Write "None"
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 - add expected endianness of RawImage encodings where relevant

### Docs

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### Description

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<table><tr><th>Before</th><th>After</th></tr><tr><td>

<!--before content goes here-->

</td><td>

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</td></tr></table>

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package.json

@@ -1,6 +1,6 @@
 {
   "name": "@foxglove/schemas",
-  "version": "1.6.3",
+  "version": "1.6.4",
   "description": "Foxglove-defined message schemas for ROS, Protobuf, and JSON",
   "license": "MIT",
   "repository": {