Bump rexml in /corese-unit-test/src/test/resources/data/rdf-star-main

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.5 to 3.3.3.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.5...v3.3.3)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

corese-unit-test/src/test/resources/data/rdf-star-main/Gemfile.lock

@@ -66,7 +66,8 @@ GEM
       rdf (~> 3.1)
       rexml (~> 3.2)
     redcarpet (3.5.1)
-    rexml (3.2.5)
+    rexml (3.3.3)
+      strscan
     scanf (1.0.0)
     sparql (3.1.8)
       builder (~> 3.2)
@@ -80,6 +81,7 @@ GEM
     sparql-client (3.1.2)
       net-http-persistent (~> 4.0, >= 4.0.1)
       rdf (~> 3.1)
+    strscan (3.1.0)
     sxp (1.1.0)
       rdf (~> 3.1)
     temple (0.8.2)