ci: update mise to 2025.6.8

Changelogs:
- https://github.com/jdx/mise/releases/tag/v2025.5.15
- https://github.com/jdx/mise/releases/tag/v2025.5.16
- https://github.com/jdx/mise/releases/tag/v2025.5.17
- https://github.com/jdx/mise/releases/tag/v2025.6.0
- https://github.com/jdx/mise/releases/tag/v2025.6.1
- https://github.com/jdx/mise/releases/tag/v2025.6.2
- https://github.com/jdx/mise/releases/tag/v2025.6.3
- https://github.com/jdx/mise/releases/tag/v2025.6.4
- https://github.com/jdx/mise/releases/tag/v2025.6.5
- https://github.com/jdx/mise/releases/tag/v2025.6.6
- https://github.com/jdx/mise/releases/tag/v2025.6.7
- https://github.com/jdx/mise/releases/tag/v2025.6.8

Author: php-coder

.github/workflows/integration-tests.yml

@@ -85,7 +85,7 @@ jobs:
       - name: Install mise to install Hurl
         uses: jdx/mise-action@v2.3.1 # https://github.com/jdx/mise-action
         with:
-          version: 2025.5.14        # [default: latest] mise version to install
+          version: 2025.6.8        # [default: latest] mise version to install
           install: true            # [default: true] run `mise install`
           cache: true              # [default: true] cache mise using GitHub's cache
           log_level: info          # [default: info] log level