fix(ci): attempt to fix ci

Author: RobinPcrd

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java: [7, 8, 11]
+        java: [8, 11]
 
     steps:
       - uses: actions/checkout@v2

pom.xml

@@ -243,8 +243,8 @@
           </execution>
         </executions>
         <configuration>
-          <source>1.7</source>
-          <target>1.7</target>
+          <source>1.8</source>
+          <target>1.8</target>
           <compilerArgs>
             <arg>-Xlint:unchecked</arg>
           </compilerArgs>