chore(deps): update dependency selenium-webdriver to v4.21.0 (#30325)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Gemfile.lock

@@ -693,7 +693,8 @@ GEM
     responders (3.1.1)
       actionpack (>= 5.2)
       railties (>= 5.2)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     rotp (6.3.0)
     rouge (4.2.1)
     rpam2 (4.0.2)
@@ -774,7 +775,7 @@ GEM
     scenic (1.8.0)
       activerecord (>= 4.0.0)
       railties (>= 4.0.0)
-    selenium-webdriver (4.20.1)
+    selenium-webdriver (4.21.0)
       base64 (~> 0.2)
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2, < 3.0)
@@ -815,6 +816,7 @@ GEM
     stringio (3.1.0)
     strong_migrations (1.8.0)
       activerecord (>= 5.2)
+    strscan (3.1.0)
     swd (1.3.0)
       activesupport (>= 3)
       attr_required (>= 0.0.5)