fix: update osType in OVA other3xLinux64Guest"

VMware vSphere considers the OVA invalid, seemingly because it considers
VirtualSCSI incompatible with osType otherLinux64Guest. Updating the osType
to other3xLinux64Guest fixes this

Fixes talos-systems#3515

Signed-off-by: Lennard Klein <lennard.klein@eu.equinix.com>

cmd/installer/pkg/ova/ova.go

@@ -47,7 +47,7 @@ const ovfTpl = `<?xml version="1.0" encoding="UTF-8"?>
   <VirtualSystem ovf:id="vm">
     <Info>A virtual machine</Info>
     <Name>talos</Name>
-    <OperatingSystemSection ovf:id="101" vmw:osType="otherLinux64Guest">
+    <OperatingSystemSection ovf:id="101" vmw:osType="other3xLinux64Guest">
       <Info>The kind of installed guest operating system</Info>
     </OperatingSystemSection>
     <VirtualHardwareSection ovf:transport="com.vmware.guestInfo">