Update blade, curses, and nokogiri

These versions are required to work on Rails with Ruby 3.1.dev,
without having to maintain a dirty Gemfile.lock

The update was done by using a version of Ruby (2.7.2) and
bundler (2.1.4) that would avoid making any big changes to the lock
file, as discovered here: #41902 (comment)

Gemfile.lock

@@ -158,18 +158,18 @@ GEM
     bcrypt (3.1.16-java)
     beaneater (1.0.0)
     benchmark-ips (2.8.4)
-    blade (0.7.1)
+    blade (0.7.2)
       activesupport (>= 3.0.0)
-      blade-qunit_adapter (~> 2.0.1)
+      blade-qunit_adapter (>= 2.0.1)
       coffee-script
       coffee-script-source
-      curses (~> 1.0.0)
+      curses (>= 1.4.0)
       eventmachine
       faye
       sprockets (>= 3.0)
       thin (>= 1.6.0)
       thor (>= 0.19.1)
-      useragent (~> 0.16.7)
+      useragent (>= 0.16.7)
     blade-qunit_adapter (2.0.1)
     bootsnap (1.5.1)
       msgpack (~> 1.0)
@@ -198,7 +198,7 @@ GEM
     crack (0.4.5)
       rexml
     crass (1.0.6)
-    curses (1.0.2)
+    curses (1.4.0)
     daemons (1.3.1)
     dalli (2.7.11)
     dante (0.2.0)
@@ -354,16 +354,16 @@ GEM
       connection_pool (~> 2.2)
     nio4r (2.5.4)
     nio4r (2.5.4-java)
-    nokogiri (1.11.1)
+    nokogiri (1.11.3)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
-    nokogiri (1.11.1-java)
+    nokogiri (1.11.3-java)
       racc (~> 1.4)
-    nokogiri (1.11.1-x64-mingw32)
+    nokogiri (1.11.3-x64-mingw32)
       racc (~> 1.4)
-    nokogiri (1.11.1-x86-mingw32)
+    nokogiri (1.11.3-x86-mingw32)
       racc (~> 1.4)
-    nokogiri (1.11.1-x86_64-darwin)
+    nokogiri (1.11.3-x86_64-darwin)
       racc (~> 1.4)
     os (1.1.1)
     parallel (1.20.1)