.github/workflows: update go, node versions

Go 1.16.0-rc.1 is no longer available.
Go 1.16 was released.
Node.js recommended version is currently 14.15.x.

Change-Id: Id9ccc2302b23ef33eeb1ac2fa33db45fce461d5e
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/293110
Trust: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Suzy Mueller <suzmue@golang.org>
diff --git a/.github/workflows/release-nightly.yml b/.github/workflows/release-nightly.yml
index 320df49..19bb203 100644
--- a/.github/workflows/release-nightly.yml
+++ b/.github/workflows/release-nightly.yml
@@ -24,7 +24,7 @@
       - name: Setup Node
         uses: actions/setup-node@v1
         with:
-          node-version: '10.x'
+          node-version: '14.x'
 
       - name: Setup Go
         uses: actions/setup-go@v2
diff --git a/.github/workflows/test-long-all.yml b/.github/workflows/test-long-all.yml
index 47fa80f..22c5bd0 100644
--- a/.github/workflows/test-long-all.yml
+++ b/.github/workflows/test-long-all.yml
@@ -17,7 +17,7 @@
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         version: ['stable', 'insiders']
-        go: ['1.15', '1.16.0-rc1']
+        go: ['1.15', '1.16']
 
     steps:
       - name: Clone repository
@@ -26,7 +26,7 @@
       - name: Setup Node
         uses: actions/setup-node@v1
         with:
-          node-version: '10.x'
+          node-version: '14.x'
 
       - name: Setup Go
         uses: actions/setup-go@v2
diff --git a/.github/workflows/test-long.yml b/.github/workflows/test-long.yml
index b4d44cf..cf5d4c6 100644
--- a/.github/workflows/test-long.yml
+++ b/.github/workflows/test-long.yml
@@ -16,7 +16,7 @@
       matrix:
         os: [ubuntu-latest, windows-latest] # TODO: reenable macos-latest
         version: ['stable']
-        go: ['1.15', '1.16.0-rc1']
+        go: ['1.15', '1.16']
 
     steps:
       - name: Clone repository
@@ -25,7 +25,7 @@
       - name: Setup Node
         uses: actions/setup-node@v1
         with:
-          node-version: '10.x'
+          node-version: '14.x'
 
       - name: Setup Go
         uses: actions/setup-go@v2
diff --git a/.github/workflows/test-smoke.yml b/.github/workflows/test-smoke.yml
index cd3b404..2dfcda2 100644
--- a/.github/workflows/test-smoke.yml
+++ b/.github/workflows/test-smoke.yml
@@ -24,12 +24,12 @@
       - name: Setup Node
         uses: actions/setup-node@v1
         with:
-          node-version: '10.x'
+          node-version: '14.x'
 
       - name: Setup Go
         uses: actions/setup-go@v2
         with:
-         go-version: '1.15'
+         go-version: '1.16'
 
       - name: Install dependencies
         run: npm ci