yaml lint enforce no empty values (#7678)

## Summary

Closes: #5663

## Testing

N/A

Signed-off-by: Connor Tsui <connor.tsui20@gmail.com>

Author: connortsui20

.github/workflows/stale.yml

@@ -2,7 +2,7 @@ name: Close inactive PRs
 on:
   schedule:
     - cron: "30 1 * * *"
-  workflow_dispatch:
+  workflow_dispatch: { }
 
 jobs:
   close-issues:

.github/workflows/web.yml

@@ -7,7 +7,7 @@ concurrency:
   cancel-in-progress: true
 
 on:
-  pull_request:
+  pull_request: { }
   push:
     branches: [develop]
 

.yamllint.yaml

@@ -29,7 +29,7 @@ rules:
   document-end: disable
   document-start: disable
   empty-lines: enable
-  empty-values: disable
+  empty-values: enable
   float-values: disable
   hyphens: enable
   indentation: enable
@@ -38,9 +38,10 @@ rules:
   line-length: disable
   new-line-at-end-of-file: enable
   new-lines: enable
-  octal-values: disable
+  octal-values: enable
   quoted-strings:
     quote-type: double
     required: false
   trailing-spaces: enable
-  truthy: disable
+  truthy:
+    check-keys: false