Fix link-checker reloaded (#7599)

One more attempt to fix the link-checker job.

This time we exclude polymesh which is reachable but not via lychee.
Also exclude rust strings that contain "{}" or "{:?}".

.config/lychee.toml

@@ -52,10 +52,15 @@ exclude = [
 	# Behind a captcha (code 403):
 	"https://chainlist.org/chain/*",
 	"https://iohk.io/en/blog/posts/2023/11/03/partner-chains-are-coming-to-cardano/",
+	"https://polymesh.network",
 	"https://www.reddit.com/r/rust/comments/3spfh1/does_collect_allocate_more_than_once_while/",
 
 	# 403 rate limited:
 	"https://etherscan.io/block/11090290",
 	"https://subscan.io/",
 	"https://substrate.stackexchange.com/.*",
+
+	# Exclude strings which contain templates like {} and {:?}
+	"%7B%7D",
+	"%7B:\\?}",
 ]