Update Paper upstream to 26.3

scripts/start-test-server.ps1

@@ -13,7 +13,7 @@ if (-not (Test-Path -LiteralPath $serverJar -PathType Leaf)) {
 
 $java = Get-Command java -ErrorAction SilentlyContinue
 if ($null -eq $java) {
-    throw "未找到 Java。Infstar 26.2 需要 Java 25。"
+    throw "未找到 Java。Infstar 26.3 需要 Java 25。"
 }
 
 Push-Location $runDirectory

scripts/start-test-server.sh

@@ -14,7 +14,7 @@ if [[ ! -f "$server_jar" ]]; then
 fi
 
 if ! command -v "$java_command" >/dev/null 2>&1; then
-    echo "未找到 Java。Infstar 26.2 需要 Java 25。" >&2
+    echo "未找到 Java。Infstar 26.3 需要 Java 25。" >&2
     exit 1
 fi