Use curl instead of wget for OpenAPI spec download

wget gets 403 Forbidden from CloudFront in CI. curl works reliably.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: shreyas-goenka

Makefile

@@ -184,7 +184,7 @@ generate:
 	go test ./bundle/internal/schema
 
 .codegen/openapi.json: .codegen/_openapi_sha
-	wget -O $@.tmp "https://openapi.dev.databricks.com/$$(cat $<)/specs/all-internal.json" && mv $@.tmp $@ && touch $@
+	curl -sL -o $@.tmp "https://openapi.dev.databricks.com/$$(cat $<)/specs/all-internal.json" && mv $@.tmp $@ && touch $@
 
 generate-direct: generate-direct-apitypes generate-direct-resources
 generate-direct-apitypes: bundle/direct/dresources/apitypes.generated.yml