.github/workflows: remove 'stable' unnecessary in setup-go@v3

https://github.com/actions/setup-go#v3
v3 recognizes unstable pre-release version without any special
setting.

Change-Id: I91c95d47d78fcd2dbeb76379eb6df909c0c4ad89
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/418539
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Suzy Mueller <suzmue@golang.org>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>

Author: hyangah

.github/workflows/test-long-all.yml

@@ -33,7 +33,6 @@ jobs:
         uses: actions/setup-go@v3
         with:
          go-version: ${{ matrix.go }}
-         stable: '!contains(${{ matrix.go }}, "beta") && !contains(${{ matrix.go }}, "rc")'
          check-latest: true
          cache: true
 

.github/workflows/test-long.yml

@@ -32,7 +32,6 @@ jobs:
         uses: actions/setup-go@v3
         with:
          go-version: ${{ matrix.go }}
-         stable: '!contains(${{ matrix.go }}, "beta") && !contains(${{ matrix.go }}, "rc")'
          check-latest: true
          cache: true
 

.github/workflows/test-smoke.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-latest, windows-latest]
         version: ['stable']
 
     steps: