Mark .hdr and .exr as binary extensions

[RobinMalfait]

This PR fixes an issue where .hdr files were scanned for candidates even though it's a binary file.

As a workaround today, you could use:

@source not "**/*.hdr";

To ignore .hdr files, but let's bake it in by default instead.

Fixes: #18733

[thecrypticace]

We should add exr as well. It's also a common HDR image format.

[RobinMalfait]

@thecrypticace added .exr as well. Going to sneak it into the next release 👀