Try updating to Maven 3.5.4

Hey, look, more checksums!

.gitlab-ci.yml

@@ -6,12 +6,14 @@ build:
     - apt-get update
     # perl provides shasum
     - apt-get install --assume-yes curl perl
-    - curl --location -o apache-maven-3.3.9-bin.tar.gz https://archive.apache.org/dist/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz
-    - md5sum --quiet --check - <<< "516923b3955b6035ba6b0a5b031fbd8b *apache-maven-3.3.9-bin.tar.gz"
-    - shasum --algorithm 1 --quiet --check - <<< "5b4c117854921b527ab6190615f9435da730ba05 *apache-maven-3.3.9-bin.tar.gz"
-    - tar -zxvf apache-maven-3.3.9-bin.tar.gz
+    - curl --location -o apache-maven-3.5.4-bin.tar.gz https://archive.apache.org/dist/maven/maven-3/3.5.4/binaries/apache-maven-3.5.4-bin.tar.gz
+    - md5sum --quiet --check - <<< "89eea39183139e5f8a0c1601d495b3b6 *apache-maven-3.5.4-bin.tar.gz"
+    - shasum --algorithm 1 --quiet --check - <<< "22cac91b3557586bb1eba326f2f7727543ff15e3 *apache-maven-3.5.4-bin.tar.gz"
+    - shasum --algorithm 256 --quiet --check - <<< "ce50b1c91364cb77efe3776f756a6d92b76d9038b0a0782f7d53acf1e997a14d *apache-maven-3.5.4-bin.tar.gz"
+    - shasum --algorithm 512 --quiet --check - <<< "2a803f578f341e164f6753e410413d16ab60fabe31dc491d1fe35c984a5cce696bc71f57757d4538fe7738be04065a216f3ebad4ef7e0ce1bb4c51bc36d6be86 *apache-maven-3.5.4-bin.tar.gz"
+    - tar -zxvf apache-maven-3.5.4-bin.tar.gz
     - export MAVEN_OPTS="-Xmx512m -XX:MaxPermSize=192m"
-    - export M2_HOME=$PWD/apache-maven-3.3.9
+    - export M2_HOME=$PWD/apache-maven-3.5.4
     - export PATH=$M2_HOME/bin:$PATH
     - mvn --version
   script: