bump proxy version to 1.0.0-dev.20250221.1 (#2216)

Co-authored-by: Scott Beddall <[email protected]>

Author: azure-sdk

eng/common/testproxy/target_version.txt

@@ -1 +1 @@
-1.0.0-dev.20241213.1
+1.0.0-dev.20250221.1