ci: remove rustup env vars, causing warnings

Author: Firestar99

.github/workflows/ci.yaml

@@ -23,9 +23,6 @@ jobs:
       matrix:
         os: [ ubuntu-latest, windows-latest, macOS-latest ]
     runs-on: ${{ matrix.os }}
-    env:
-      RUSTUP_UNPACK_RAM: "26214400"
-      RUSTUP_IO_THREADS: "1"
     steps:
       - uses: actions/checkout@v4
       - name: Install Vulkan SDK
@@ -84,9 +81,6 @@ jobs:
         os: [ ubuntu-latest ]
         target: [ aarch64-linux-android ]
     runs-on: ${{ matrix.os }}
-    env:
-      RUSTUP_UNPACK_RAM: "26214400"
-      RUSTUP_IO_THREADS: "1"
     steps:
       - uses: actions/checkout@v4
       - name: Install Vulkan SDK