fix: update samples snippet to write to BYTES instead of ARRAY<BYTES> (#2876)

* fix: update snippet to write to BYTES instead of ARRAY<BYTES>

* 🦉 Updates from OwlBot post-processor

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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: forksumit

samples/snippets/src/main/java/com/example/bigquery/InsertingDataTypes.java

@@ -30,6 +30,7 @@
 import com.google.cloud.bigquery.TableDefinition;
 import com.google.cloud.bigquery.TableId;
 import com.google.cloud.bigquery.TableInfo;
+import java.util.Base64;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -53,10 +54,7 @@ public static void insertingDataTypes(String datasetName, String tableName) {
       // Inserting data types
       Field name = Field.of("name", StandardSQLTypeName.STRING);
       Field age = Field.of("age", StandardSQLTypeName.INT64);
-      Field school =
-          Field.newBuilder("school", StandardSQLTypeName.BYTES)
-              .setMode(Field.Mode.REPEATED)
-              .build();
+      Field school = Field.of("school", StandardSQLTypeName.BYTES);
       Field location = Field.of("location", StandardSQLTypeName.GEOGRAPHY);
       Field measurements =
           Field.newBuilder("measurements", StandardSQLTypeName.FLOAT64)
@@ -86,7 +84,7 @@ public static void insertingDataTypes(String datasetName, String tableName) {
       Map<String, Object> rowContent = new HashMap<>();
       rowContent.put("name", "Tom");
       rowContent.put("age", 30);
-      rowContent.put("school", "Test University".getBytes());
+      rowContent.put("school", Base64.getEncoder().encodeToString("Test University".getBytes()));
       rowContent.put("location", "POINT(1 2)");
       rowContent.put("measurements", new Float[] {50.05f, 100.5f});
       rowContent.put("datesTime", datesTimeContent);