Update version guard from R2025b to R2026a

With the rearrangement of versions, the R2025b guard is no longer correct here. Those changes ended up being pushed to R2026a.

Author: sameagen-MW

plugins/+ciplugins/+github/getDefaultPlugins.m

@@ -6,7 +6,7 @@
     pluginProviderData (1,1) struct = struct();
 end
 
-if isMATLABReleaseOlderThan("R2025b")
+if isMATLABReleaseOlderThan("R2026a")
     reportPlugin = ciplugins.github.BuildSummaryPlugin();
 else
     reportPlugin = ciplugins.github.ParallelizableBuildSummaryPlugin();