update JDK versions in build pipeline (#18)

* remove 14, 15, 16 jdk from build
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 276d0f9..15e3224 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -29,7 +29,7 @@
     strategy:
       fail-fast: false
       matrix:
-        jdk: [7, 8, 11, 14, 15-ea]
+        jdk: [7, 8, 11, 17]
         #os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps: