feat: support baggage propagation in httpc (#2375)

* feat: support baggage propagation in httpc

* chore: use go 1.16

* chore: use go 1.16

* chore: use go ^1.16

* chore: remove deprecated

.github/workflows/go.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Set up Go 1.x
         uses: actions/setup-go@v2
         with:
-          go-version: ^1.15
+          go-version: ^1.16
         id: go
 
       - name: Check out code into the Go module directory
@@ -43,7 +43,7 @@ jobs:
       - name: Set up Go 1.x
         uses: actions/setup-go@v2
         with:
-          go-version: ^1.15
+          go-version: ^1.16
 
       - name: Checkout codebase
         uses: actions/checkout@v3