Enable code coverage on the nightly CI job

Author: DilumAluthge

.github/workflows/ci.nightly.yml

@@ -37,7 +37,7 @@ jobs:
           - julia-version: 'nightly'
             julia-wordsize: '64'
             github-runner: ubuntu-latest
-            coverage: false
+            coverage: true
     steps:
       - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
       - uses: julia-actions/setup-julia@9b79636afcfb07ab02c256cede01fe2db6ba808c # v2.6.0