GH-2943 remove hadoop-2 support

- remove the hadoop-2 profile
- set base hadoop 3 version to 3.3.0

Author: steveloughran

pom.xml

@@ -74,7 +74,8 @@
     <javax.annotation.version>1.3.2</javax.annotation.version>
     <spotless.version>2.30.0</spotless.version>
     <shade.prefix>shaded.parquet</shade.prefix>
-    <hadoop.version>3.3.6</hadoop.version>
+    <!-- Guarantees no newer classes/methods/constants are used by parquet. -->
+    <hadoop.version>3.3.0</hadoop.version>
     <parquet.format.version>2.10.0</parquet.format.version>
     <previous.version>1.13.1</previous.version>
     <thrift.executable>thrift</thrift.executable>
@@ -635,13 +636,6 @@
       </properties>
     </profile>
 
-    <profile>
-      <id>hadoop2</id>
-      <properties>
-        <hadoop.version>2.7.3</hadoop.version>
-      </properties>
-    </profile>
-
     <!-- Profile for tests to have more output -->
     <profile>
       <id>verbose-test</id>