GHA/windows: drop `handle64.exe`

To test its effect on stability/flakiness of Windows jobs.

Ref: https://github.com/curl/curl/pull/16484#issuecomment-2705016375
Cherry-picked from #16484
Closes #16600
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index bd00062..3a5af0f 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -338,7 +338,6 @@
         timeout-minutes: 5
         run: |
           /c/ProgramData/chocolatey/choco.exe install --yes --no-progress --limit-output --timeout 180 --force stunnel || true
-          curl --disable --fail --silent --show-error --connect-timeout 15 --max-time 60 --retry 3 https://live.sysinternals.com/handle64.exe --output /bin/handle64.exe
 
       - name: 'run tests'
         if: ${{ matrix.tflags != 'skipall' && matrix.tflags != 'skiprun' }}
@@ -485,7 +484,6 @@
         timeout-minutes: 5
         run: |
           /c/ProgramData/chocolatey/choco.exe install --yes --no-progress --limit-output --timeout 180 --force stunnel || true
-          curl --disable --fail --silent --show-error --connect-timeout 15 --max-time 60 --retry 3 https://live.sysinternals.com/handle64.exe --output /bin/handle64.exe
           python3 -m pip --disable-pip-version-check --no-input --no-cache-dir install --progress-bar off --prefer-binary impacket
 
       - name: 'downgrade msys2-runtime'
@@ -891,7 +889,6 @@
           if [[ '${{ matrix.name }}' != *'gnutls'* ]]; then
             /c/ProgramData/chocolatey/choco.exe install --yes --no-progress --limit-output --timeout 180 --force stunnel openssh || true
           fi
-          curl --disable --fail --silent --show-error --connect-timeout 15 --max-time 60 --retry 3 https://live.sysinternals.com/handle64.exe --output /bin/handle64.exe
           python3 -m pip --disable-pip-version-check --no-input --no-cache-dir install --progress-bar off --prefer-binary impacket
 
       - name: 'downgrade msys2-runtime'