Try to sort out build issue

Build.ps1

@@ -8,7 +8,7 @@ $branch = @{ $true = $env:APPVEYOR_REPO_BRANCH; $false = $(git symbolic-ref --sh
 $revision = @{ $true = "{0:00000}" -f [convert]::ToInt32("0" + $env:APPVEYOR_BUILD_NUMBER, 10); $false = "local" }[$env:APPVEYOR_BUILD_NUMBER -ne $NULL];
 $suffix = @{ $true = ""; $false = "$branch-$revision"}[$branch -eq "main" -and $revision -ne "local"]
 
-foreach ($src in ls src/Serilog.*) {
+foreach ($src in gci src/Serilog.*) {
     Push-Location $src
 
 	if ($suffix) {
@@ -21,7 +21,7 @@ foreach ($src in ls src/Serilog.*) {
     Pop-Location
 }
 
-foreach ($test in ls test/Serilog.*.Tests) {
+foreach ($test in gci test/Serilog.*.Tests) {
     Push-Location $test
 
     & dotnet test -c Release

appveyor.yml

@@ -1,10 +1,10 @@
 version: '{build}'
 skip_tags: true
-image: Visual Studio 2019
+image: Visual Studio 2022
 install:
-  - ps: mkdir -Force ".\build\" | Out-Null
+  - pwsh: mkdir -Force ".\build\" | Out-Null
 build_script:
-- ps: ./Build.ps1
+- pwsh: ./Build.ps1
 test: off
 artifacts:
 - path: artifacts/Serilog.*.nupkg

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "5.0.401",
+    "version": "6.0.400",
     "rollForward": "latestFeature"
   }
 }