Move riscv64 Ubuntu builder to stable (#750)

Rename `riscv64 Ubuntu23` to `riscv64 Ubuntu`.

Author: StanFromIreland

master/custom/builders.py

@@ -298,6 +298,9 @@ def generate_builderdefs(tags, tuples):
     # Linux x86 (32-bit) GCC
     ("x86 Debian Non-Debug with X", "ware-debian-x86", NonDebugUnixBuild),
     ("x86 Debian Installed with X", "ware-debian-x86", UnixInstalledBuild),
+
+    # riscv64 GCC
+    ("riscv64 Ubuntu", "onder-riscv64", SlowUnixInstalledBuild),
 ]))
 
 
@@ -415,9 +418,6 @@ def generate_builderdefs(tags, tuples):
     # Solaris sparcv9
     ("SPARCv9 Oracle Solaris 11.4", "kulikjak-solaris-sparcv9", UnixBuild),
 
-    # riscv64 GCC
-    ("riscv64 Ubuntu23", "onder-riscv64", SlowUnixInstalledBuild),
-
     # Arch Usan (see stable "AMD64 Arch Linux Usan Function" above)
     ("AMD64 Arch Linux Usan", "pablogsal-arch-x86_64", ClangUbsanLinuxBuild),
 ]))