Bumped checkout to v3 for GitHub Action

Bumped nokogiri from 1.12.5 to 1.13.3 in /docs

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
   steps:
 
   - name: Clone sfall
-    uses: actions/checkout@v2
+    uses: actions/checkout@v3
 
   # Action is used twice for self-testing only
   # DevXP build results are intentionally *not* included in artifact

.github/workflows/gh-pages.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Setup Python
         uses: actions/setup-python@v2

docs/Gemfile.lock

@@ -180,21 +180,21 @@ GEM
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9.7)
     mercenary (0.3.6)
-    mini_portile2 (2.5.3)
+    mini_portile2 (2.8.0)
     minima (2.1.1)
       jekyll (~> 3.3)
     minitest (5.11.3)
     multipart-post (2.1.1)
     net-dns (0.9.0)
-    nokogiri (1.11.6)
-      mini_portile2 (~> 2.5.0)
+    nokogiri (1.13.3)
+      mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     octokit (4.14.0)
       sawyer (~> 0.8.0, >= 0.5.3)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (2.0.5)
-    racc (1.5.2)
+    racc (1.6.0)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)
       ffi (~> 1.0)