chore(ci): upgrade golangci-lint to v2.0.2 (oauth2-proxy#7)

Upgrade golangci-lint to v2.0.2 from v1.63.4.

There isn't a .golangci.yml configuration in the repo, so let's just use the
new defaults of v2.

Author: dolmen

.github/workflows/ci.yaml

@@ -27,7 +27,7 @@ jobs:
 
     - name: Get dependencies
       env:
-        GOLANGCI_LINT_VERSION: v1.63.4
+        GOLANGCI_LINT_VERSION: v2.0.2
       run: |
         curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin ${GOLANGCI_LINT_VERSION}
         curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter