chore: fix release branch name

Author: queil

build/build.fs

@@ -66,7 +66,7 @@ let gitRepoName = "FsConfig"
 
 let gitHubRepoUrl = sprintf "https://github.com/%s/%s" gitOwner gitRepoName
 
-let releaseBranch = "main"
+let releaseBranch = "master"
 
 let tagFromVersionNumber versionNumber = sprintf "v%s" versionNumber