build with go1.20 (#854)

* build with go1.20

This has been out for a bit and is up to go1.20.4. We have been using
go1.20 for the Slack builds and have seen no issues.

* need the quotes

* use go install

.github/workflows/smoke.yml

@@ -18,10 +18,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.19
+    - name: Set up Go 1.20
       uses: actions/setup-go@v2
       with:
-        go-version: 1.19
+        go-version: "1.20"
       id: go
 
     - name: Check out code into the Go module directory
@@ -30,9 +30,9 @@ jobs:
     - uses: actions/cache@v2
       with:
         path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go1.19-${{ hashFiles('**/go.sum') }}
+        key: ${{ runner.os }}-go1.20-${{ hashFiles('**/go.sum') }}
         restore-keys: |
-          ${{ runner.os }}-go1.19-
+          ${{ runner.os }}-go1.20-
 
     - name: build
       run: make bin-docker