Use workspace instead of importMap in deno.jsonc

Author: lambdalisue

.github/workflows/test.yml

@@ -108,7 +108,8 @@ jobs:
         run: |
           deno cache \
             --config ${DENOPS_TEST_DENOPS_PATH}/denops/@denops-private/deno.jsonc \
-            ${DENOPS_TEST_DENOPS_PATH}/denops/@denops-private/mod.ts ./denops/fall/main.ts
+            ${DENOPS_TEST_DENOPS_PATH}/denops/@denops-private/mod.ts
+          deno cache ./denops/fall/main.ts
 
       - name: Test
         run: deno task test:coverage

deno.jsonc

@@ -18,5 +18,7 @@
     "update:write": "deno task -q update --write",
     "update:commit": "deno task -q update --commit --prefix :package: --pre-commit=fmt,lint"
   },
-  "importMap": "./denops/fall/import_map.json"
+  "workspace": [
+    "./denops/fall"
+  ]
 }