Extend some 3rd party timestamp overrides

These are components with new major versions, which require
investigation to determine the extent to which backwards
compatibility is broken. No one is demanding they be
updated immediately, so we defer that work until later.

Author: ctrueden

timestamps.txt

@@ -1,6 +1,6 @@
 ca.mcgill:Sholl_Analysis 20191023000000
 com.google.guava:guava 20200101000000
-com.opencsv:opencsv 20200101000000
+com.opencsv:opencsv 20200701000000
 hsqldb:hsqldb 20190101000000
 net.imagej:imagej-mesh-io 20190703000000
 net.imagej:imagej-notebook 20190703000000
@@ -17,8 +17,8 @@ net.imagej:imagej-usage 20190624120000
 net.imagej:op-finder 20190703000000
 net.imglib2:imglib2-algorithm-fft 20191024000000
 net.java.dev.jna:jna 20200101000000
-org.apache.poi:poi 20200101000000
-org.apache.spark:spark-core_2.11 20200101000000
+org.apache.poi:poi 20200701000000
+org.apache.spark:spark-core_2.11 20200701000000
 org.jmockit:jmockit 20200101000000
 org.mockito:mockito-core 20200101000000
 org.scijava:j3dcore 20180905120000