Merge pull request #84397 from swiftlang/use-main-string-processing

Switch to plain `main` string processing branch

Author: shahmishal

utils/update_checkout/update-checkout-config.json

@@ -173,7 +173,7 @@
                 "swift-docc-symbolkit": "main",
                 "swift-markdown": "main",
                 "swift-nio": "2.65.0",
-                "swift-experimental-string-processing": "swift/main",
+                "swift-experimental-string-processing": "main",
                 "swift-sdk-generator": "main",
                 "wasi-libc": "wasi-sdk-27",
                 "wasmkit": "0.1.6",
@@ -601,7 +601,7 @@
                 "swift-docc-symbolkit": "main",
                 "swift-markdown": "main",
                 "swift-nio": "2.65.0",
-                "swift-experimental-string-processing": "swift/main",
+                "swift-experimental-string-processing": "main",
                 "swift-sdk-generator": "main",
                 "wasi-libc": "wasi-sdk-27",
                 "wasmkit": "0.1.6",
@@ -659,7 +659,7 @@
                 "swift-docc-symbolkit": "main",
                 "swift-markdown": "main",
                 "swift-nio": "2.65.0",
-                "swift-experimental-string-processing": "swift/main",
+                "swift-experimental-string-processing": "main",
                 "swift-sdk-generator": "main",
                 "wasi-libc": "wasi-sdk-27",
                 "wasmkit": "0.1.6",