chore: Remove version number from axe.d.ts (#1499)

This patch removes the version number from `axe.d.ts`. I think the original idea behind keeping it here was to update it every time we release, but this hasn't been happening lately.

Removing the version does not have any effect on TypeScript users; instead, it just removes an easy to break/forget part of our internal processes 😃



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- [x] Follows the commit message policy, appropriate for next version
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- [x] Includes new tests, or was unnecessary
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axe.d.ts

@@ -1,4 +1,4 @@
-// Type definitions for axe-core 3.0.2
+// Type definitions for axe-core
 // Project: https://github.com/dequelabs/axe-core
 // Definitions by: Marcy Sutton <https://github.com/marcysutton>