MAINTAINERS: git://github -> https://github.com for kvm-riscv

Github deprecated the git:// links about a year ago, so let's move to
the https:// URLs instead.
Reported-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://github.blog/2021-09-01-improving-git-protocol-security-github/Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

MAINTAINERS

@@ -11241,7 +11241,7 @@ L:	kvm@vger.kernel.org
 L:	kvm-riscv@lists.infradead.org
 L:	linux-riscv@lists.infradead.org
 S:	Maintained
-T:	git git://github.com/kvm-riscv/linux.git
+T:	git https://github.com/kvm-riscv/linux.git
 F:	arch/riscv/include/asm/kvm*
 F:	arch/riscv/include/uapi/asm/kvm*
 F:	arch/riscv/kvm/