Fix the dataset link in the RGB image gallery example #3781
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The "RGB images" gallery example was originally added in #2641. The example tiff file was from https://map.openaerialmap.org/#/-156.64478302001953,20.89666397351934,11/square/022300003203/64d6ae6619cb3a000147a65f?resolution=high&_k=nh7cia.
It turns out the source URL of the tiff has changed a little.
This PR fixes #3771.
Preview: https://pygmt-dev--3781.org.readthedocs.build/en/3781/gallery/images/rgb_image.html