Update dependency slather to v2.8.4

Gemfile.lock

@@ -5,7 +5,7 @@ GEM
       base64
       nkf
       rexml
-    activesupport (7.1.3.2)
+    activesupport (7.1.4)
       base64
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.0.2)
@@ -37,7 +37,7 @@ GEM
       aws-eventstream (~> 1, >= 1.0.2)
     babosa (1.0.4)
     base64 (0.2.0)
-    bigdecimal (3.1.7)
+    bigdecimal (3.1.8)
     claide (1.1.0)
     clamp (1.3.2)
     colored (1.2)
@@ -166,7 +166,7 @@ GEM
     http-cookie (1.0.5)
       domain_name (~> 0.5)
     httpclient (2.8.3)
-    i18n (1.14.4)
+    i18n (1.14.5)
       concurrent-ruby (~> 1.0)
     jmespath (1.6.2)
     json (2.7.2)
@@ -181,17 +181,17 @@ GEM
     nanaimo (0.3.0)
     naturally (2.2.1)
     nkf (0.2.0)
-    nokogiri (1.16.4-aarch64-linux)
+    nokogiri (1.16.7-aarch64-linux)
       racc (~> 1.4)
-    nokogiri (1.16.4-arm-linux)
+    nokogiri (1.16.7-arm-linux)
       racc (~> 1.4)
-    nokogiri (1.16.4-arm64-darwin)
+    nokogiri (1.16.7-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.16.4-x86-linux)
+    nokogiri (1.16.7-x86-linux)
       racc (~> 1.4)
-    nokogiri (1.16.4-x86_64-darwin)
+    nokogiri (1.16.7-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.16.4-x86_64-linux)
+    nokogiri (1.16.7-x86_64-linux)
       racc (~> 1.4)
     optparse (0.5.0)
     os (1.1.4)
@@ -204,7 +204,8 @@ GEM
       trailblazer-option (>= 0.1.1, < 0.2.0)
       uber (< 0.2.0)
     retriable (3.1.2)
-    rexml (3.2.6)
+    rexml (3.2.9)
+      strscan
     rouge (2.0.7)
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
@@ -217,12 +218,13 @@ GEM
     simctl (1.6.10)
       CFPropertyList
       naturally
-    slather (2.8.0)
+    slather (2.8.3)
       CFPropertyList (>= 2.2, < 4)
       activesupport
       clamp (~> 1.3)
       nokogiri (>= 1.14.3)
       xcodeproj (~> 1.21)
+    strscan (3.1.0)
     terminal-notifier (2.0.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)