Pin Go 1.20.5 in integration-tests

Avoid testcontainers breakage due to validation added in Go 1.20.6 until
that issue is resolved. Keep the global version bump to 1.20.6 to
resolve CVEs.

.github/workflows/consul-dataplane-checks.yaml

@@ -42,7 +42,12 @@ jobs:
       - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
       - uses: actions/setup-go@fac708d6674e30b6ba41289acaab6d4b75aa0753 # v4.0.1
         with:
-          go-version: ${{ needs.get-go-version.outputs.go-version }}
+          # pinning this to 1.20.5 because this issue in go-testcontainers occurs
+          # in 1.20.6 with the error "http: invalid Host header, host port waiting failed"
+          # https://github.com/testcontainers/testcontainers-go/issues/1359
+          # remove setting this when the above issue is fixed so that the job will
+          # just get the go version from .go-version.
+          go-version: 1.20.5
       - run: make docker
       #  Currently the server version below is set to 1.15-dev: integration-tests/main_test.go
       - run: echo "VERSION=$(make version)" >> $GITHUB_ENV