fix(ci): reduce lychee concurrency to avoid GitHub rate limits

Author: upbqdn

.github/workflows/docs-check.yml

@@ -37,7 +37,7 @@ jobs:
       contents: read
       pull-requests: read
     runs-on: ubuntu-latest
-    timeout-minutes: 15
+    timeout-minutes: 30
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 #v6.0.1
         with:

.lychee.toml

@@ -57,10 +57,10 @@ exclude_loopback = true
 cache = true
 
 # Maximum age of cached results
-max_cache_age = "1d"
+max_cache_age = "7d"
 
 # Maximum concurrent requests
-max_concurrency = 16
+max_concurrency = 2
 
 # User agent string
 user_agent = "lychee/0.14 (Zebra link checker; https://github.com/ZcashFoundation/zebra)"
@@ -70,5 +70,4 @@ include_mail = false
 
 # Retry configuration
 max_retries = 3
-retry_wait_time = 2
-
+retry_wait_time = 10