Update logo.svg (#231)

Plume Network have a new logo.
Here is the new one.

### Description

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Summary of change.
Example: Add sepolia chain
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### Backward compatibility

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Are these changes backward compatible? Note that additions are backwards
compatible.

Yes/No
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### Testing

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Have any new metadata configs and deployment addresses been used with
any Hyperlane tooling, such as the CLI?
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Co-authored-by: J M Rossy <[email protected]>

.changeset/curly-elephants-wave.md

@@ -0,0 +1,5 @@
+---
+"@hyperlane-xyz/registry": patch
+---
+
+Update plumetestnet logo