std.Target: Bump baseline bpfel/bpfeb model to v3.

llvm/llvm-project#131691

Author: alexrp

lib/std/Target.zig

@@ -1919,7 +1919,7 @@ pub const Cpu = struct {
                     else => generic(arch),
                 },
                 .avr => &avr.cpu.avr2,
-                .bpfel, .bpfeb => &bpf.cpu.v1,
+                .bpfel, .bpfeb => &bpf.cpu.v3,
                 .csky => &csky.cpu.ck810, // gcc/clang do not have a generic csky model.
                 .hexagon => &hexagon.cpu.hexagonv60, // gcc/clang do not have a generic hexagon model.
                 .lanai => &lanai.cpu.v11, // clang does not have a generic lanai model.