Sync eng/common directory with azure-sdk-tools for PR 12061 (#42983)

* bump the test-proxy version
* bump proxy to one that includes our multipart/formdata fix

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Co-authored-by: Scott Beddall (from Dev Box) <[email protected]>

Author: azure-sdk

eng/common/testproxy/target_version.txt

@@ -1 +1 @@
-1.0.0-dev.20250805.1
+1.0.0-dev.20250922.2