Fix CI failure due to missing lock file

Remove `cache: true` from `.github/workflows/ci.yml` as `packages.lock.json` is not present in the repository, causing `actions/setup-dotnet` to fail.

Co-authored-by: winnerspiros <1675249+winnerspiros@users.noreply.github.com>

Author: google-labs-jules[bot]

.github/workflows/ci.yml

@@ -19,7 +19,6 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: "8.0.x"
-          cache: true
 
       - name: Restore Tools
         run: dotnet tool restore
@@ -79,7 +78,6 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: "8.0.x"
-          cache: true
 
       - name: Compile
         run: dotnet build -c Debug -warnaserror osu.Desktop.slnf
@@ -129,7 +127,6 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: "8.0.x"
-          cache: true
 
       - name: Install .NET workloads
         run: dotnet workload install android wasi-experimental
@@ -150,7 +147,6 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: "8.0.x"
-          cache: true
 
       - name: Install .NET Workloads
         run: dotnet workload install ios