Merge bitcoin/bitcoin#28902: doc: Simplify guix install doc, after 1.4 release

fa552e8 doc: Simplify guix install doc, after 1.4 release (MarcoFalke)

Pull request description:

  Now that 1.4 is out (for a while), remove the recommendation to build a random commit.

ACKs for top commit:
  fanquake:
    ACK fa552e8
  hebasto:
    ACK fa552e8.

Tree-SHA512: f5642df201ff0e2af8a7ae9660a66920ddbb5f522b3e921f6f4aa7c411ced23afa91bdfe43b943ac012228eebbaad3396df505d00aa8f721a4358f03fda9d8e3

Author: fanquake

contrib/guix/INSTALL.md

@@ -389,10 +389,7 @@ git clone https://git.savannah.gnu.org/git/guix.git
 cd guix
 ```
 
-You will likely want to build the latest release, however, if the latest release
-when you're reading this is still 1.3.0 then you may want to use 998eda30 instead
-to avoid the issues described in [#25099](
-https://github.com/bitcoin/bitcoin/pull/25099).
+You will likely want to build the latest release.
 
 ```
 git branch -a -l 'origin/version-*'  # check for the latest release