Rust already exists on the platform - update it instead (#1864)

Co-authored-by: Dave Belvedere <dave@protonmail.com>

.github/workflows/ci.yml

@@ -284,13 +284,11 @@ jobs:
               uses: actions/checkout@v3
 
               # Run build
-            - name: Install Rustup using win.rustup.rs
+            - name: Update Rustup
               run: |
                   # disable download progress bar
                   $ProgressPreference = "SilentlyContinue"
-                  Invoke-WebRequest https://win.rustup.rs/ -OutFile rustup-init.exe
-                  .\rustup-init.exe -y --default-host=x86_64-pc-windows-msvc --default-toolchain=none
-                  del rustup-init.exe
+                  rustup update
                   rustup target add ${{ matrix.target }}
               shell: powershell