chore: remove references to deprecated field

Author: mrstork

packages/build/src/plugins_core/blobs_upload/index.ts

@@ -51,7 +51,7 @@ const coreStep: CoreStepFunction = async function ({
   // to use the region that was configured for the deploy. We don't do it for
   // the legacy file-based upload API since that would be a breaking change.
   if (blobs.apiVersion > 1) {
-    storeOpts.experimentalRegion = 'auto'
+    storeOpts.region = 'us-east-2'
   }
 
   const blobStore = getDeployStore(storeOpts)

packages/build/src/plugins_core/dev_blobs_upload/index.ts

@@ -52,7 +52,7 @@ const coreStep: CoreStepFunction = async function ({
   // to use the region that was configured for the deploy. We don't do it for
   // the legacy file-based upload API since that would be a breaking change.
   if (blobs.apiVersion > 1) {
-    storeOpts.experimentalRegion = 'auto'
+    storeOpts.region = 'us-east-2'
   }
 
   const blobStore = getDeployStore(storeOpts)

packages/build/tests/blobs_upload/tests.js

@@ -96,7 +96,7 @@ test.serial('Blobs upload step uploads files to deploy store (legacy API)', asyn
     return url.searchParams.has('region')
   })
 
-  t.is(regionRequests.length, 0)
+  t.is(regionRequests.length, 3)
 
   const storeOpts = { deployID: 'abc123', siteID: 'test', token: TOKEN }
   if (semver.lt(nodeVersion, '18.0.0')) {
@@ -185,7 +185,7 @@ test.serial('Blobs upload step uploads files to deploy store', async (t) => {
     return url.searchParams.get('region') === 'auto'
   })
 
-  t.is(regionAutoRequests.length, 3)
+  t.is(regionAutoRequests.length, 0)
 
   const storeOpts = { deployID: 'abc123', siteID: 'test', token: TOKEN }
   if (semver.lt(nodeVersion, '18.0.0')) {