Update devDependencies and gems.

Gemfile.lock

@@ -42,7 +42,8 @@ GEM
       nokogiri (~> 1.9)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    kramdown (2.1.0)
+    kramdown (2.2.1)
+      rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.3)
@@ -61,11 +62,12 @@ GEM
     rb-fsevent (0.10.3)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rouge (3.17.0)
+    rexml (3.2.4)
+    rouge (3.18.0)
     safe_yaml (1.0.5)
-    sassc (2.2.1)
+    sassc (2.3.0)
       ffi (~> 1.9)
-    sassc (2.2.1-x64-mingw32)
+    sassc (2.3.0-x64-mingw32)
       ffi (~> 1.9)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)

package.json

@@ -120,12 +120,12 @@
     "clean-css-cli": "^4.3.0",
     "cross-env": "^7.0.2",
     "eslint": "^6.8.0",
-    "find-unused-sass-variables": "^1.0.5",
+    "find-unused-sass-variables": "^2.0.0",
     "glob": "^7.1.6",
     "hammer-simulator": "0.0.1",
     "ip": "^1.1.5",
     "jquery": "^3.5.0",
-    "karma": "^5.0.1",
+    "karma": "^5.0.2",
     "karma-browserstack-launcher": "1.4.0",
     "karma-chrome-launcher": "^3.1.0",
     "karma-coverage-istanbul-reporter": "^2.1.1",
@@ -135,20 +135,20 @@
     "karma-sinon": "^1.0.5",
     "linkinator": "^2.0.6",
     "lockfile-lint": "^4.2.2",
-    "node-sass": "^4.13.1",
+    "node-sass": "^4.14.0",
     "nodemon": "^2.0.3",
     "npm-run-all": "^4.1.5",
     "popper.js": "^1.16.0",
-    "postcss-cli": "^7.1.0",
+    "postcss-cli": "^7.1.1",
     "qunit": "2.9.2",
-    "rollup": "^2.6.1",
+    "rollup": "^2.7.3",
     "rollup-plugin-babel": "^4.4.0",
-    "shelljs": "^0.8.3",
+    "shelljs": "^0.8.4",
     "shx": "^0.3.2",
     "sinon": "^7.5.0",
-    "stylelint": "^13.3.2",
+    "stylelint": "^13.3.3",
     "stylelint-config-twbs-bootstrap": "^2.0.1",
-    "terser": "^4.6.11",
+    "terser": "^4.6.12",
     "vnu-jar": "20.3.16"
   },
   "files": [