fix(ci): bump a2ml/k9-validate-action pins to canonical (#19)

Re-sync stale `dogfood-gate.yml` action pins to canonical
(template-source already merged: rsr-template-repo#56 / v3-templater#75
/ reposystem#50).

a2ml-validate-action -> `59145c7` (off the exit-127-broken `86c6da6`)
k9-validate-action -> `2d96f43`

Refs hyperpolymath/standards#85

Author: hyperpolymath

.github/workflows/dogfood-gate.yml

@@ -38,7 +38,7 @@ jobs:
 
       - name: Validate A2ML manifests
         if: steps.detect.outputs.count > 0
-        uses: hyperpolymath/a2ml-validate-action@86c6da6d2e9c8c07adaff2737ca7d4b5f7d793af # main
+        uses: hyperpolymath/a2ml-validate-action@59145c7d1039fa3059b3ecacdb50ee23d7505898 # main
         with:
           path: '.'
           strict: 'false'
@@ -86,7 +86,7 @@ jobs:
 
       - name: Validate K9 contracts
         if: steps.detect.outputs.k9_count > 0
-        uses: hyperpolymath/k9-validate-action@cfa7f92f6bed88e706a481f7f520e4580d7b9599 # main
+        uses: hyperpolymath/k9-validate-action@2d96f43c538964b097d159ed3a56ba5b5ceca227 # main
         with:
           path: '.'
           strict: 'false'
@@ -306,3 +306,4 @@ jobs:
           *Generated by the [Dogfood Gate](https://github.com/hyperpolymath/rsr-template-repo) workflow.*
           *Dogfooding is guinea pig fooding — we test our tools on ourselves.*
           EOF
+