docs: update broken link

docs/learning-resources.md

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 - [When An Error Is Not An Exception](https://dev.to/vncz/forewords-and-domain-model-1p13) — How we rewrote the core of Prism to make it almost totally functional
 - [Introduction series to FP-TS](https://ybogomolov.me/01-higher-kinded-types/) by Yuriy Bogomolov
 - [The ReaderTaskMonad](https://andywhite.xyz/posts/) by Andy White
-- [FP-TS for HTTP-requests](https://kimmosaaskilahti.fi/blog/2019-08-29-fp-ts/) by Kimmo Sasskilahti
+- [FP-TS for HTTP-requests](https://kimmosaaskilahti.fi/blog/2019/08/29/using-fp-ts-for-http-requests-and-validation/) by Kimmo Sasskilahti
 - [Basic introduction to FP-TS](https://davetayls.me/blog/2018/06/09/fp-ts-02-handling-error-cases) by Dave Tayls
 - [Practical guide to FP-TS](https://rlee.dev/practical-guide-to-fp-ts-part-1) by Ryan Lee