Updating gems to test dependabot PRs

Gemfile.lock

@@ -197,9 +197,9 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
-    loofah (2.18.0)
+    loofah (2.22.0)
       crass (~> 1.0.2)
-      nokogiri (>= 1.5.9)
+      nokogiri (>= 1.12.0)
     mail (2.7.1)
       mini_mime (>= 0.1.1)
     marc (1.0.4)
@@ -223,7 +223,7 @@ GEM
     mysql2 (0.5.4)
     netrc (0.11.0)
     nio4r (2.5.8)
-    nokogiri (1.13.7-x86_64-linux)
+    nokogiri (1.15.5-x86_64-linux)
       racc (~> 1.4)
     nulldb (0.3.7.pre.alpha.1)
       activerecord (>= 2.0.0)
@@ -246,8 +246,8 @@ GEM
     public_suffix (4.0.7)
     puma (4.3.12)
       nio4r (~> 2.0)
-    racc (1.6.0)
-    rack (2.2.4)
+    racc (1.7.3)
+    rack (2.2.8)
     rack-protection (2.2.0)
       rack
     rack-test (2.0.2)
@@ -272,8 +272,9 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.4.3)
-      loofah (~> 2.3)
+    rails-html-sanitizer (1.6.0)
+      loofah (~> 2.21)
+      nokogiri (~> 1.14)
     railties (5.2.8)
       actionpack (= 5.2.8)
       activesupport (= 5.2.8)