Issue-1108: Remove IOException never thrown in S3Resource methods

It can facilitate the implementation of Comparator based on contentLength or lastModified

spring-cloud-aws-s3/src/main/java/io/awspring/cloud/s3/S3Resource.java

@@ -130,23 +130,23 @@ public boolean exists() {
 	}
 
 	@Override
-	public long contentLength() throws IOException {
+	public long contentLength() {
 		if (headMetadata == null) {
 			fetchMetadata();
 		}
 		return headMetadata.contentLength;
 	}
 
 	@Override
-	public long lastModified() throws IOException {
+	public long lastModified() {
 		if (headMetadata == null) {
 			fetchMetadata();
 		}
 		return headMetadata.lastModified.toEpochMilli();
 	}
 
 	@Override
-	public File getFile() throws IOException {
+	public File getFile() {
 		throw new UnsupportedOperationException("Amazon S3 resource can not be resolved to java.io.File objects.Use "
 				+ "getInputStream() to retrieve the contents of the object!");
 	}

spring-cloud-aws-s3/src/test/java/io/awspring/cloud/s3/S3ResourceIntegrationTests.java

@@ -122,7 +122,7 @@ void existsReturnsFalseWhenObjectDoesNotExist(S3OutputStreamProvider s3OutputStr
 	}
 
 	@TestAvailableOutputStreamProviders
-	void objectHasContentLength(S3OutputStreamProvider s3OutputStreamProvider) throws IOException {
+	void objectHasContentLength(S3OutputStreamProvider s3OutputStreamProvider) {
 		String contents = "test-file-content";
 		client.putObject(PutObjectRequest.builder().bucket("first-bucket").key("test-file.txt").build(),
 				RequestBody.fromString(contents));