Bump rails-html-sanitizer from 1.6.0 to 1.6.1 in /backend

Bumps [rails-html-sanitizer](https://github.com/rails/rails-html-sanitizer) from 1.6.0 to 1.6.1.
- [Release notes](https://github.com/rails/rails-html-sanitizer/releases)
- [Changelog](https://github.com/rails/rails-html-sanitizer/blob/main/CHANGELOG.md)
- [Commits](rails/rails-html-sanitizer@v1.6.0...v1.6.1)

---
updated-dependencies:
- dependency-name: rails-html-sanitizer
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

backend/Gemfile.lock

@@ -241,7 +241,7 @@ GEM
     letter_opener (1.10.0)
       launchy (>= 2.2, < 4)
     lint_roller (1.1.0)
-    loofah (2.22.0)
+    loofah (2.23.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
     mail (2.8.1)
@@ -253,7 +253,7 @@ GEM
     matrix (0.4.2)
     method_source (1.1.0)
     mini_mime (1.1.5)
-    mini_portile2 (2.8.7)
+    mini_portile2 (2.8.8)
     minitest (5.24.1)
     mongo (2.20.1)
       bson (>= 4.14.1, < 6.0.0)
@@ -286,7 +286,7 @@ GEM
     net-smtp (0.5.0)
       net-protocol
     nio4r (2.7.3)
-    nokogiri (1.16.6)
+    nokogiri (1.16.8)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     oauth2 (1.4.7)
@@ -330,7 +330,7 @@ GEM
       multi_json (~> 1.15)
       pusher-signature (~> 0.1.8)
     pusher-signature (0.1.8)
-    racc (1.8.0)
+    racc (1.8.1)
     rack (2.2.9)
     rack-cors (2.0.1)
       rack (>= 2.0.0)
@@ -360,9 +360,9 @@ GEM
       activesupport (>= 5.0.0)
       minitest
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.6.0)
+    rails-html-sanitizer (1.6.1)
       loofah (~> 2.21)
-      nokogiri (~> 1.14)
+      nokogiri (>= 1.15.7, != 1.16.7, != 1.16.6, != 1.16.5, != 1.16.4, != 1.16.3, != 1.16.2, != 1.16.1, != 1.16.0.rc1, != 1.16.0)
     rails_12factor (0.0.3)
       rails_serve_static_assets
       rails_stdout_logging