A release tarball has no VCS data and -buildvcs is off, so the main module
version is "(devel)" and every release build calls itself "1.9.15+dev.", both
in --version and in the User-Agent. The version in main.go is the right one.

--- a/internal/app/app.go
+++ b/internal/app/app.go
@@ -107,16 +107,6 @@
 				}
 			}
 		}
-
-		// Check version from -buildvcs info
-		// Format for tagged version : v1.9.13
-		// Format for modified code:   v1.9.14-0.20251215184105-753d6617ab58+dirty
-		if info.Main.Version != "v"+Version {
-			// Format: 1.9.13+dev.753d661[.dirty]
-			// Compatible with "awesomeversion" and "packaging.version" from python.
-			// Version will be larger than the previous release, but smaller than the next release.
-			Version += "+dev." + revision
-		}
 	}
 	return
 }