macos: Remove some stale entitlements

Remove some macOS entitlements that are not necessary for the current
iteration of Dangerzone. Those are the ability to run as a hypervisor,
and the ability to accept network connections. They are a relic from
when we were experimenting with VMs, instead of relying on Docker
Desktop.

install/macos/entitlements.plist

@@ -10,11 +10,5 @@
         <true/>
         <key>com.apple.security.network.client</key>
         <true/>
-        <key>com.apple.security.network.server</key>
-        <true/>
-        <key>com.apple.security.hypervisor</key>
-        <true/>
-        <key>com.apple.security.cs.allow-unsigned-executable-memory</key>
-        <true/>
     </dict>
-</plist>
+</plist>