chore(deps): update GitHub Actions versions (#83)

- Bump actions/checkout from v4 to v6
- Bump actions/setup-python from v5 to v6
- Bump peter-evans/create-pull-request from v6 to v8

This replaces Dependabot PRs #64, #65, #66 which were blocked
by the agents workflow guard due to protected file modifications.

Author: stranske

.github/workflows/agents-issue-optimizer.yml

@@ -64,11 +64,11 @@ jobs:
 
       - name: Checkout repository
         if: steps.check.outputs.should_run == 'true'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
         if: steps.check.outputs.should_run == 'true'
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.11'
 

.github/workflows/auto-revision-issues.yml

@@ -23,10 +23,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: "3.11"
 

.github/workflows/build_dashboard.yml

@@ -11,8 +11,8 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
       - name: Build dashboard

.github/workflows/ci_admin.yml

@@ -13,8 +13,8 @@ jobs:
     name: Validate rubric YAML files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
       - name: Install PyYAML
@@ -34,8 +34,8 @@ jobs:
     name: Validate config YAML files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
       - name: Install PyYAML
@@ -62,8 +62,8 @@ jobs:
     name: Validate time logs
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
       - name: Validate time log template
@@ -91,8 +91,8 @@ jobs:
     name: Validate expense logs
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
       - name: Validate expense logs
@@ -113,8 +113,8 @@ jobs:
     name: Validate friction logs
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
       - name: Validate friction logs
@@ -135,8 +135,8 @@ jobs:
     name: Validate documentation links
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
       - name: Check internal markdown links