fix(gradle): fix migrations (#26739)

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## Current Behavior
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Gradle migrations aren't added properly.

## Expected Behavior
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Gradle migrations run

## Related Issue(s)
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merged. -->

Fixes #

packages/gradle/package.json

@@ -30,7 +30,7 @@
     "./migrations.json": "./migrations.json",
     "./generators.json": "./generators.json"
   },
-  "nx-migrate": {
+  "nx-migrations": {
     "migrations": "./migrations.json"
   },
   "dependencies": {