Bump graalvm/setup-graalvm from 1.6.7 to 1.6.8

Bumps [graalvm/setup-graalvm](https://github.com/graalvm/setup-graalvm) from 1.6.7 to 1.6.8.
- [Release notes](https://github.com/graalvm/setup-graalvm/releases)
- [Commits](graalvm/setup-graalvm@27b360d...f70bc80)

---
updated-dependencies:
- dependency-name: graalvm/setup-graalvm
  dependency-version: 1.6.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -200,7 +200,7 @@ jobs:
           problem-matcher: false
 
       - name: Install GraalVM 25 for the image
-        uses: graalvm/setup-graalvm@27b360dbb857524eaf0b4c4cef364d38e5b4f173 # v1.6.7
+        uses: graalvm/setup-graalvm@f70bc8032f90a104502824a54bcb94b6f01715bc # v1.6.8
         with:
           java-version: '25'
           distribution: 'graalvm-community'

.github/workflows/release.yml

@@ -114,7 +114,7 @@ jobs:
           java-version: '21'
 
       - name: Install GraalVM 25 for the image
-        uses: graalvm/setup-graalvm@27b360dbb857524eaf0b4c4cef364d38e5b4f173 # v1.6.7
+        uses: graalvm/setup-graalvm@f70bc8032f90a104502824a54bcb94b6f01715bc # v1.6.8
         with:
           java-version: '25'
           distribution: 'graalvm-community'