chore(deps-dev): bump undici from 6.11.1 to 6.13.0 (elastic#3975)

test(undici): reduce testing of undici@6 on older Node.js v18 versions because of undici breakage

Starting with undici@6.13.0, it breaks on Node.js 18.13.0 and earlier.
Undici somewhat officially only supports the latest minor version of supported
Node.js majors, so we'll bump our testing to only more recent Node.js v18 versions.

Refs: nodejs/undici#3123
Co-authored-by: Trent Mick <trent.mick@elastic.co>

.tav.yml

@@ -481,7 +481,7 @@ undici:
   - versions:
       mode: max-7
       include: '>=6.0.0 <7'
-    node: '>=18'
+    node: '>=18.17.0'
     commands: node test/instrumentation/modules/undici/undici.test.js
   - versions:
       mode: max-7

test/_is_undici_incompat.js

@@ -29,7 +29,10 @@ function isUndiciIncompat() {
   const undiciVer = require('undici/package.json').version;
   const msg = `undici@${undiciVer} is incompatible with node@${nodeVer}`;
 
-  if (satisfies(undiciVer, '>=6.0.0') && satisfies(nodeVer, '<18.0.0')) {
+  if (satisfies(undiciVer, '>=6.13.0') && satisfies(nodeVer, '<18.17.0')) {
+    // See discussion at https://github.com/nodejs/undici/issues/3123
+    return msg;
+  } else if (satisfies(undiciVer, '>=6.0.0') && satisfies(nodeVer, '<18.0.0')) {
     return msg;
   } else if (
     satisfies(undiciVer, '>=5.28.0') &&