.github/workflows: use delve at master

In order to test the latest changes to delve dap, we have to
pull in the latest code. This change does this for the workflows.

go get package@version is supported in both go1.15 and in go1.16,
with go1.15 requiring GO111MODULE=on, which we already set to
download the Go tools.

Change-Id: I6d89b77edc6b028dd8e8ed9bfe4e82ccdfdaba73
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/295416
Trust: Suzy Mueller <suzmue@golang.org>
Run-TryBot: Suzy Mueller <suzmue@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
diff --git a/.github/workflows/release-nightly.yml b/.github/workflows/release-nightly.yml
index 19bb203..0fd28c3 100644
--- a/.github/workflows/release-nightly.yml
+++ b/.github/workflows/release-nightly.yml
@@ -63,7 +63,7 @@
             go get github.com/cweill/gotests/...
             go get github.com/rogpeppe/godef
             go get github.com/ramya-rao-a/go-outline
-            go get github.com/go-delve/delve/cmd/dlv
+            go get github.com/go-delve/delve/cmd/dlv@master
         env:
           GO111MODULE: on
           EXT: "${{ matrix.os == 'windows-latest' && '.exe' || ''}}"
diff --git a/.github/workflows/test-long-all.yml b/.github/workflows/test-long-all.yml
index 22c5bd0..a999273 100644
--- a/.github/workflows/test-long-all.yml
+++ b/.github/workflows/test-long-all.yml
@@ -59,7 +59,7 @@
             go get github.com/cweill/gotests/...
             go get github.com/rogpeppe/godef
             go get github.com/ramya-rao-a/go-outline
-            go get github.com/go-delve/delve/cmd/dlv
+            go get github.com/go-delve/delve/cmd/dlv@master
         env:
           GO111MODULE: on
           EXT: "${{ matrix.os == 'windows-latest' && '.exe' || ''}}"
diff --git a/.github/workflows/test-long.yml b/.github/workflows/test-long.yml
index cf5d4c6..4d6119b 100644
--- a/.github/workflows/test-long.yml
+++ b/.github/workflows/test-long.yml
@@ -58,7 +58,7 @@
             go get github.com/cweill/gotests/...
             go get github.com/rogpeppe/godef
             go get github.com/ramya-rao-a/go-outline
-            go get github.com/go-delve/delve/cmd/dlv
+            go get github.com/go-delve/delve/cmd/dlv@master
         env:
           GO111MODULE: on
           EXT: "${{ matrix.os == 'windows-latest' && '.exe' || ''}}"
diff --git a/.github/workflows/test-smoke.yml b/.github/workflows/test-smoke.yml
index 2dfcda2..9dcb91c 100644
--- a/.github/workflows/test-smoke.yml
+++ b/.github/workflows/test-smoke.yml
@@ -56,7 +56,7 @@
             go get github.com/cweill/gotests/...
             go get github.com/rogpeppe/godef
             go get github.com/ramya-rao-a/go-outline
-            go get github.com/go-delve/delve/cmd/dlv
+            go get github.com/go-delve/delve/cmd/dlv@master
         env:
           GO111MODULE: on
           EXT: "${{ matrix.os == 'windows-latest' && '.exe' || ''}}"