fix: Gemfile.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-HAML-20341

Latest report for codeforamerica/ohana-api:
https://snyk.io/test/github/codeforamerica/ohana-api

Gemfile.lock

@@ -152,19 +152,20 @@ GEM
       haml (>= 4.0.6, < 5.0)
       html2haml (>= 1.0.1)
       railties (>= 4.0.1)
-    haml_lint (0.20.0)
-      haml (~> 4.0)
+    haml_lint (0.23.1)
+      haml (>= 4.0, < 5.1)
+      rainbow
       rake (>= 10, < 13)
       rubocop (>= 0.47.0)
       sysexits (~> 1.1)
     hashdiff (0.3.2)
     heapy (0.1.2)
-    html2haml (2.0.0)
+    html2haml (2.1.0)
       erubis (~> 2.7.0)
-      haml (~> 4.0.0)
-      nokogiri (~> 1.6.0)
+      haml (~> 4.0)
+      nokogiri (>= 1.6.0)
       ruby_parser (~> 3.5)
-    i18n (0.8.0)
+    i18n (0.8.1)
     ice_nine (0.11.2)
     jquery-rails (4.2.2)
       rails-dom-testing (>= 1, < 3)
@@ -194,7 +195,7 @@ GEM
     mime-types-data (3.2016.0521)
     mini_portile2 (2.1.0)
     minitest (5.10.1)
-    nokogiri (1.6.8.1)
+    nokogiri (1.7.0.1)
       mini_portile2 (~> 2.1.0)
     orm_adapter (0.5.0)
     parser (2.3.3.1)
@@ -289,7 +290,7 @@ GEM
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.8.1)
     ruby_dep (1.5.0)
-    ruby_parser (3.8.1)
+    ruby_parser (3.8.4)
       sexp_processor (~> 4.1)
     rubyzip (1.2.1)
     safe_yaml (1.0.4)
@@ -302,7 +303,7 @@ GEM
       tilt (>= 1.1, < 3)
     select2-rails (3.5.10)
       thor (~> 0.14)
-    sexp_processor (4.7.0)
+    sexp_processor (4.8.0)
     shoulda-matchers (3.1.1)
       activesupport (>= 4.0.0)
     simplecov (0.12.0)
@@ -334,7 +335,7 @@ GEM
     test_after_commit (1.1.0)
       activerecord (>= 3.2)
     thor (0.19.4)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     tilt (2.0.6)
     tins (1.13.2)
     tzinfo (1.2.2)