chore(ci): update GitHub Actions and SHA-pin docs.yml

Updates GitHub Actions to their latest releases and switches
.github/workflows/docs.yml from floating major tags to commit-SHA pins, so
every actions/* reference is pinned by SHA with a version comment (matching
the convention used in the other workflows).

- actions/checkout          v6.0.2       -> v7.0.1  (docs.yml was already @v7)
- actions/setup-python       v6 / v6.3.0 -> v7.1.0
- actions/setup-node        v6.4.0       -> v7.1.0
- actions/upload-artifact    v7.0.1      -> v7.0.2
- actions/configure-pages                -> v6.0.0 (SHA-pinned)
- actions/upload-pages-artifact          -> v5.0.0 (SHA-pinned)
- actions/deploy-pages                   -> v5.0.1 (SHA-pinned)

peter-evans/create-pull-request (v8.1.1) and
peter-evans/enable-pull-request-automerge (v3.0.0) are already on their
latest releases and left unchanged.

Safe for our usage: checkout v7 only changes pull_request_target /
workflow_run behavior (unused here); setup-python v7 drops the unused
pip-install input (both usages pass only python-version / cache).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           ref: ${{ github.event.inputs.branch_or_tag }}
           submodules: 'true'
@@ -48,14 +48,14 @@ jobs:
 
       - name: Upload Artifacts
         if: contains(matrix.info.os, 'windows') == true
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
           name: ${{ steps.set_artifact_name.outputs.artifact_name }}
           path: release-binaries/*
 
       - name: Setup node
         if: matrix.info.os == 'macos-latest'
-        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7.1.0
         with:
           node-version: 20
 
@@ -69,7 +69,7 @@ jobs:
 
       - name: Upload Document Artifacts
         if: matrix.info.os == 'macos-latest'
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
           name: wela-documents
           path: |