Invoke `mkdir` with `-Force`

build/azure-pipelines/win32/continuous-build-win32.yml

@@ -13,7 +13,7 @@ steps:
       addToPath: true
 
   - powershell: |
-      mkdir -p .build
+      mkdir -Force .build
       node build/azure-pipelines/common/computeNodeModulesCacheKey.js > .build/yarnlockhash
     displayName: Prepare yarn cache flags
 

build/azure-pipelines/win32/product-build-win32.yml

@@ -52,7 +52,7 @@ steps:
     condition: and(succeeded(), eq(variables['ENABLE_TERRAPIN'], 'true'))
 
   - powershell: |
-      mkdir -p .build
+      mkdir -Force .build
       node build/azure-pipelines/common/computeNodeModulesCacheKey.js $VSCODE_ARCH $ENABLE_TERRAPIN > .build/yarnlockhash
     displayName: Prepare yarn cache flags