Update maremma and dependicies

Includes bug fix for lookup of landing pages behind proxys

Gemfile.lock

@@ -212,7 +212,7 @@ GEM
     equivalent-xml (0.6.0)
       nokogiri (>= 1.4.3)
     erubi (1.9.0)
-    excon (0.67.0)
+    excon (0.71.1)
     facets (3.1.0)
     factory_bot (4.11.1)
       activesupport (>= 3.0.0)
@@ -313,17 +313,17 @@ GEM
       rest-client (~> 2.0.2)
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
-    maremma (4.4)
+    maremma (4.5)
       activesupport (>= 4.2.5, < 6)
       addressable (>= 2.3.6)
       builder (~> 3.2, >= 3.2.2)
-      excon (~> 0.67.0)
-      faraday (~> 0.17.0)
+      excon (~> 0.71.0)
+      faraday (= 0.17.0)
       faraday-encoding (~> 0.0.4)
       faraday_middleware (~> 0.13.1)
-      multi_json (~> 1.12)
       nokogiri (~> 1.10.4)
       oj (>= 2.8.3)
+      oj_mimic_json (~> 1.0, >= 1.0.1)
     method_source (0.9.2)
     mime-types (3.3)
       mime-types-data (~> 3.2015)