Upgrade: Bump rubocop-rspec from 3.1.0 to 3.2.0 in /web/backend

Bumps [rubocop-rspec](https://github.com/rubocop/rubocop-rspec) from 3.1.0 to 3.2.0.
- [Release notes](https://github.com/rubocop/rubocop-rspec/releases)
- [Changelog](https://github.com/rubocop/rubocop-rspec/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-rspec@v3.1.0...v3.2.0)

---
updated-dependencies:
- dependency-name: rubocop-rspec
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

web/backend/Gemfile.lock

@@ -103,7 +103,7 @@ GEM
     jbuilder (2.13.0)
       actionview (>= 5.0.0)
       activesupport (>= 5.0.0)
-    json (2.7.2)
+    json (2.7.4)
     language_server-protocol (3.17.0.3)
     logger (1.6.1)
     loofah (2.22.0)
@@ -231,7 +231,7 @@ GEM
       rack (>= 1.1)
       rubocop (>= 1.52.0, < 2.0)
       rubocop-ast (>= 1.31.1, < 2.0)
-    rubocop-rspec (3.1.0)
+    rubocop-rspec (3.2.0)
       rubocop (~> 1.61)
     ruby-progressbar (1.13.0)
     securerandom (0.3.1)