Use Go 1.17 for golangci linting and update golangci/golangci-lint-ac…

…tion

Go 1.18 is not supported by golangci-lint yet since generics are not
supported.

Signed-off-by: Ethan Lowman <ethan.lowman@datadoghq.com>

.github/workflows/tests.yml

@@ -63,5 +63,5 @@ jobs:
       - name: golangci-lint
         uses: golangci/golangci-lint-action@537aa1903e5d359d0b27dbc19ddd22c5087f3fbc
         with:
-          version: v1.45.2
+          version: v1.49.0
           args: --timeout 3m

.golangci.yml

@@ -1,3 +1,9 @@
+run:
+  # Lint using Go 1.17, since some linters are disabled by default for Go 1.18
+  # until generics are supported.
+  # See https://github.com/golangci/golangci-lint/issues/2649
+  go: '1.17'
+
 linters:
   disable-all: true
   enable: