feat: compare upstream runtime version in the hook

src/doctor.ts

@@ -1,9 +1,11 @@
 import { getProtocolInterface } from "./deps.ts";
+import { isNewSemverRelease } from "./utilities.ts";
 
 type RuntimeVersion = {
   name: string;
   current: string;
   minimum?: string;
+  message?: string;
   error?: {
     message: string;
   };
@@ -28,6 +30,13 @@ const getHostedDenoRuntimeVersion = async (): Promise<{
     const message = Deno.version.deno !== version
       ? `Applications deployed to Slack use Deno version ${version}`
       : undefined;
+    if (isNewSemverRelease(Deno.version.deno, version)) {
+      return {
+        minimum: version,
+        message,
+        error: { message: "The installed runtime version is not supported" },
+      };
+    }
     return { minimum: version, message };
   } catch (err) {
     if (err instanceof Error) {

src/tests/doctor_test.ts

@@ -96,7 +96,7 @@ Deno.test("doctor hook tests", async (t) => {
     assertEquals(actual, expected);
   });
 
-  await t.step("mismatched upstream requirements note difference", async () => {
+  await t.step("unsupported upstream runtimes note differences", async () => {
     mockFetch.mock("GET@/slackcli/metadata.json", (_req: Request) => {
       return new Response(JSON.stringify(MOCK_SLACK_CLI_MANIFEST));
     });
@@ -110,6 +110,9 @@ Deno.test("doctor hook tests", async (t) => {
           current: "1.2.3",
           minimum: "1.101.1",
           message: "Applications deployed to Slack use Deno version 1.101.1",
+          error: {
+            message: "The installed runtime version is not supported",
+          },
         },
         {
           name: "typescript",