doc: change response to time-permitting (#26)

Update response to be consistent with defined target values as per
https://github.com/nodejs/package-maintenance/blob/main/docs/PACKAGE-SUPPORT.md#support-target

Signed-off-by: Michael Dawson <[email protected]>

Author: mhdawson

package-support.json

@@ -6,7 +6,7 @@
         "node": "supported"
       },
       "response": {
-        "type": "best-effort"
+        "type": "time-permitting"
       },
       "backing": {
         "hobby": "https://github.com/pkgjs/support"