build: tell upload-artifact to upload what i told it to upload

upload-artifact tries to protect me by refusing to upload hidden files,
even if I explicitly request those files with my `path` setting.  Issue
here: actions/upload-artifact#614

I have to enable hidden file uploads to get it to work with 4.4.

Author: nedbat

.github/workflows/coverage.yml

@@ -129,6 +129,7 @@ jobs:
         with:
           name: metacov-${{ env.MATRIX_ID }}
           path: .metacov.*
+          include-hidden-files: true
 
   combine:
     name: "Combine coverage data"
@@ -187,6 +188,7 @@ jobs:
         with:
           name: html_report
           path: htmlcov
+          include-hidden-files: true
 
       - name: "Get total"
         id: total

.github/workflows/kit.yml

@@ -308,6 +308,5 @@ jobs:
         uses: actions/upload-artifact@834a144ee995460fba8ed112a2fc961b36a5ec5a # v4.3.6
         with:
           name: signatures
-          path: |
-            *.sigstore.json
+          path: *.sigstore.json
           retention-days: 7