Bump rexml from 3.2.6 to 3.2.8 in /svc-bgs-api/src (#2997)

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.6 to 3.2.8.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.6...v3.2.8)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

svc-bgs-api/src/Gemfile.lock

@@ -67,7 +67,8 @@ GEM
     racc (1.7.3)
     rack (3.0.9.1)
     rbtree (0.4.6)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -94,6 +95,7 @@ GEM
     sorted_set (1.0.3)
       rbtree
       set (~> 1.0)
+    strscan (3.1.0)
     timeout (0.4.1)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)