testing: Version bump to 5.4.0

References #1382.

testing/testing.conf

@@ -31,7 +31,7 @@ fi
 : ${KERNELPATCH=ha-4.2-abicompat.patch.bz2}
 
 # strongSwan version used in tests
-: ${SWANVERSION=5.3.3}
+: ${SWANVERSION=5.4.0}
 
 # Build directory where the guest kernel and images will be built
 : ${BUILDDIR=$TESTDIR/build}