Update more github actions (bytecodealliance#12775)

Missed in the prior update...

Author: alexcrichton

.github/actions/build-adapter-provider/action.yml

@@ -9,7 +9,7 @@ inputs:
 runs:
   using: composite
   steps:
-    - uses: actions/download-artifact@v4
+    - uses: actions/download-artifact@v8
       with:
         name: bins-wasi-preview1-component-adapter
         path: crates/wasi-preview1-component-adapter/provider/artefacts

.github/workflows/main.yml

@@ -1383,7 +1383,7 @@ jobs:
     permissions:
       issues: write
     steps:
-    - uses: actions/github-script@v7
+    - uses: actions/github-script@v8
       with:
         script: |
           github.rest.issues.create({