Bump bootstrap from 4.1.1 to 4.1.3

Bumps [bootstrap](https://github.com/twbs/bootstrap-rubygem) from 4.1.1 to 4.1.3.
- [Release notes](https://github.com/twbs/bootstrap-rubygem/releases)
- [Changelog](https://github.com/twbs/bootstrap-rubygem/blob/master/CHANGELOG.md)
- [Commits](twbs/bootstrap-rubygem@v4.1.1...v4.1.3)

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

Gemfile.lock

@@ -54,7 +54,7 @@ GEM
     bcrypt (3.1.13)
     bootsnap (1.3.0)
       msgpack (~> 1.0)
-    bootstrap (4.1.1)
+    bootstrap (4.1.3)
       autoprefixer-rails (>= 6.0.3)
       popper_js (>= 1.12.9, < 2)
       sass (>= 3.5.2)
@@ -118,7 +118,7 @@ GEM
     exception_notification (4.2.2)
       actionmailer (>= 4.0, < 6)
       activesupport (>= 4.0, < 6)
-    execjs (2.7.0)
+    execjs (2.8.1)
     fabrication (2.20.1)
     faker (1.8.7)
       i18n (>= 0.7)
@@ -222,7 +222,7 @@ GEM
       arel (>= 6)
     phantomjs-binaries (2.1.1.1)
       sys-uname (= 0.9.0)
-    popper_js (1.12.9)
+    popper_js (1.16.0)
     pry (0.14.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -269,9 +269,9 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
     rake (13.0.6)
-    rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
+    rb-fsevent (0.11.0)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
     redcarpet (3.5.1)
     regexp_parser (2.1.1)
     request_store (1.4.1)
@@ -302,7 +302,7 @@ GEM
       ffi (~> 1.9)
     ruby_dep (1.5.0)
     rubyzip (2.3.2)
-    sass (3.5.6)
+    sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)