ci: bump setup-python to v6 and drop pip cache (Node 24 crash)

GitHub's default runners moved to Node 24, where `actions/setup-python@v5`
with `cache: pip` crashes at setup with `Error: Maximum call stack size
exceeded`. This was breaking deploy-pages, verify-status, coverage-report,
the weekly jobs, and the techapi-* comment workflows.

Apply the same fix already used by test.yml: bump `actions/setup-python`
to `@v6` and remove `cache: pip` (bump alone does not fix the crash —
removing the cache does). Also drop the now-orphaned `cache-dependency-path`
in techapi-pr-validation-comment.yml.

Fixes #44

Author: Seungpyo1007

.github/workflows/coverage-report.yml

@@ -27,10 +27,9 @@ jobs:
           repository: GetTechAPI/TechAPI
           path: TechAPI
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
-          cache: pip
 
       - name: Install
         run: pip install -e .

.github/workflows/deploy-pages.yml

@@ -29,10 +29,9 @@ jobs:
           repository: GetTechAPI/TechAPI
           path: TechAPI
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
-          cache: pip
 
       - name: Install Python deps
         run: pip install -e .

.github/workflows/dump-refresh.yml

@@ -32,10 +32,9 @@ jobs:
           path: techapi
           token: ${{ secrets.TECHENGINEBOT_TOKEN || secrets.TECHAPI_TOKEN || secrets.GITHUB_TOKEN }}
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
-          cache: pip
 
       - name: Install TechEngine
         run: pip install -e .

.github/workflows/refresh-data.yml

@@ -26,10 +26,9 @@ jobs:
           repository: GetTechAPI/TechAPI
           path: TechAPI
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
-          cache: pip
 
       - name: Install
         run: pip install -e .

.github/workflows/techapi-pr-validation-comment.yml

@@ -59,13 +59,9 @@ jobs:
           ref: main
           path: TechAPI-main
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
-          cache: pip
-          # Avoid the default whole-workspace manifest search after the large
-          # TechAPI PR and main worktrees have been checked out.
-          cache-dependency-path: pyproject.toml
 
       - name: Detect TechAPI homepage changes
         id: site_changes

.github/workflows/techapi-verify-comment.yml

@@ -67,10 +67,9 @@ jobs:
           path: TechAPI
           fetch-depth: 0
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
-          cache: pip
 
       - name: Install TechEngine
         run: pip install -e .

.github/workflows/validate-data.yml

@@ -27,7 +27,7 @@ jobs:
           repository: GetTechAPI/TechAPI
           ref: ${{ inputs.data-ref }}
           path: TechAPI
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - name: Validate seed JSON (§9.3, §15.3)

.github/workflows/verify-network.yml

@@ -48,10 +48,9 @@ jobs:
           fetch-depth: 0
           token: ${{ secrets.TECHENGINEBOT_TOKEN || secrets.TECHAPI_TOKEN || secrets.GITHUB_TOKEN }}
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
-          cache: pip
 
       - name: Install TechEngine
         run: pip install -e .

.github/workflows/verify-status.yml

@@ -37,10 +37,9 @@ jobs:
           path: TechAPI
           token: ${{ secrets.TECHENGINEBOT_TOKEN || secrets.TECHAPI_TOKEN || secrets.GITHUB_TOKEN }}
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
-          cache: pip
 
       - name: Install TechEngine
         run: pip install -e .

.github/workflows/weekly-ingest.yml

@@ -44,10 +44,9 @@ jobs:
           path: TechAPI
           token: ${{ secrets.TECHENGINEBOT_TOKEN || secrets.TECHAPI_TOKEN || secrets.GITHUB_TOKEN }}
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
-          cache: pip
 
       - name: Install
         run: pip install -e .