switch to require java 17

Author: ryber

.java-version

@@ -1 +1 @@
-11
+17

pom.xml

@@ -24,8 +24,8 @@
 
     <properties>
         <preferred.encoding>UTF-8</preferred.encoding>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <inceptionYear>2018</inceptionYear>