Merge pull request #50639 from SebTardif

* close-inspecting-output-stream:
  Close FileOutputStream delegate in InspectingOutputStream

Closes gh-50639

Author: snicoll

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/io/InspectedContent.java

@@ -146,6 +146,11 @@ private InspectingOutputStream(Inspector[] inspectors) {
 			this.delegate = new ByteArrayOutputStream();
 		}
 
+		@Override
+		public void close() throws IOException {
+			this.delegate.close();
+		}
+
 		@Override
 		public void write(int b) throws IOException {
 			this.singleByteBuffer[0] = (byte) (b & 0xFF);