Bump dependencies

Gemfile.lock

@@ -58,11 +58,11 @@ GEM
     ast (2.4.0)
     auto_strip_attributes (2.4.0)
       activerecord (>= 4.0)
-    autoprefixer-rails (8.2.0)
+    autoprefixer-rails (9.3.1)
       execjs
     bcrypt (3.1.11)
     bindex (0.5.0)
-    bootstrap (4.0.0)
+    bootstrap (4.1.3)
       autoprefixer-rails (>= 6.0.3)
       popper_js (>= 1.12.9, < 2)
       sass (>= 3.5.2)
@@ -94,7 +94,7 @@ GEM
       warden (~> 1.2.3)
     erubi (1.7.1)
     execjs (2.7.0)
-    ffi (1.9.23)
+    ffi (1.9.25)
     formtastic (3.1.5)
       actionpack (>= 3.2.13)
     formtastic_i18n (0.6.0)
@@ -154,7 +154,7 @@ GEM
     pg (1.0.0)
     polyamorous (1.3.3)
       activerecord (>= 3.0)
-    popper_js (1.12.9)
+    popper_js (1.14.3)
     powerpack (0.1.1)
     public_suffix (3.0.2)
     puma (3.11.3)
@@ -212,8 +212,8 @@ GEM
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.9.0)
     ruby_dep (1.5.0)
-    rubyzip (1.2.1)
-    sass (3.5.6)
+    rubyzip (1.2.2)
+    sass (3.6.0)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)