ci: pin setup-uv to v8.1.0 (no floating v8 tag exists)

astral-sh/setup-uv only publishes a floating major up to v7; v8 exists only
as exact tags, so @v8 failed to resolve. Pin the exact latest v8.1.0.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: vdavez

.github/workflows/lint.yml

@@ -26,7 +26,7 @@ jobs:
     - uses: actions/checkout@v6
 
     - name: Install uv
-      uses: astral-sh/setup-uv@v8
+      uses: astral-sh/setup-uv@v8.1.0
       with:
         version: "latest"
 
@@ -79,7 +79,7 @@ jobs:
 
     - name: Install uv
       if: steps.gate.outputs.ready == 'true'
-      uses: astral-sh/setup-uv@v8
+      uses: astral-sh/setup-uv@v8.1.0
       with:
         version: "latest"
 

.github/workflows/publish.yml

@@ -13,7 +13,7 @@ jobs:
     - uses: actions/checkout@v6
 
     - name: Install uv
-      uses: astral-sh/setup-uv@v8
+      uses: astral-sh/setup-uv@v8.1.0
       with:
         version: 'latest'
 

.github/workflows/test.yml

@@ -23,7 +23,7 @@ jobs:
     - uses: actions/checkout@v6
 
     - name: Install uv
-      uses: astral-sh/setup-uv@v8
+      uses: astral-sh/setup-uv@v8.1.0
       with:
         version: "latest"
 

CHANGELOG.md

@@ -9,7 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### CI
 - Bumped GitHub Actions off the deprecated Node 20 runtime (forced off
-  2026-06-02): `actions/checkout` v4→v6, `astral-sh/setup-uv` v4→v8, and
+  2026-06-02): `actions/checkout` v4→v6, `astral-sh/setup-uv` v4→v8.1.0
+  (pinned exact — no floating `v8` major tag is published yet), and
   `codecov/codecov-action` v3→v5 (with the renamed `files:` input).
 
 ## [1.1.1] - 2026-05-29