Update known wrapper checksums (#868)

Automatically generated pull request to update the known wrapper
checksums.

In case of conflicts, manually run the workflow from the [Actions
tab](https://github.com/gradle/actions/actions/workflows/update-checksums-file.yml),
the changes will then be force-pushed onto this pull request branch.
Do not manually update the pull request branch; those changes might get
overwritten.

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Before merging, close and then directly reopen this pull request to
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sources/src/wrapper-validation/wrapper-checksums.json

@@ -1,4 +1,16 @@
 [
+  {
+    "version": "9.4.0-rc-2",
+    "checksum": "55243ef57851f12b070ad14f7f5bb8302daceeebc5bce5ece5fa6edb23e1145c"
+  },
+  {
+    "version": "9.5.0-milestone-5",
+    "checksum": "55243ef57851f12b070ad14f7f5bb8302daceeebc5bce5ece5fa6edb23e1145c"
+  },
+  {
+    "version": "9.5.0-milestone-4",
+    "checksum": "55243ef57851f12b070ad14f7f5bb8302daceeebc5bce5ece5fa6edb23e1145c"
+  },
   {
     "version": "9.5.0-milestone-3",
     "checksum": "55243ef57851f12b070ad14f7f5bb8302daceeebc5bce5ece5fa6edb23e1145c"