feat: warn about sdk update with feature dependencies (#5065)

frontend/src/component/feature/Dependencies/AddDependencyDialogue.test.tsx

@@ -114,6 +114,8 @@ test('Add dependency', async () => {
     const addButton = await screen.findByText('Add');
     userEvent.click(addButton);
 
+    await screen.findByText('Client SDK support for feature dependencies');
+
     await waitFor(() => {
         expect(closed).toBe(true);
     });

frontend/src/component/feature/Dependencies/AddDependencyDialogue.tsx

@@ -13,6 +13,7 @@ import { usePendingChangeRequests } from 'hooks/api/getters/usePendingChangeRequ
 import useToast from 'hooks/useToast';
 import { formatUnknownError } from 'utils/formatUnknownError';
 import { usePlausibleTracker } from 'hooks/usePlausibleTracker';
+import { DependenciesUpgradeAlert } from './DependenciesUpgradeAlert';
 
 interface IAddDependencyDialogueProps {
     project: string;
@@ -189,10 +190,12 @@ export const AddDependencyDialogue = ({
             secondaryButtonText='Cancel'
         >
             <Box>
+                <DependenciesUpgradeAlert />
+                <Box sx={{ mt: 2, mb: 4 }}>
                     Your feature will be evaluated only when the selected parent
                     feature is enabled in the same environment.
-                <br />
+                </Box>
-                <br />
+
                 <Typography>What feature do you want to depend on?</Typography>
                 <ConditionallyRender
                     condition={showDependencyDialogue}

frontend/src/component/feature/Dependencies/DependenciesUpgradeAlert.tsx

@@ -0,0 +1,22 @@
+import { Alert } from '@mui/material';
+
+export const DependenciesUpgradeAlert = () => {
+    return (
+        <Alert severity='warning'>
+            Remember to update your Unleash client! Feature dependencies require
+            new SDK versions. Read more about <DependenciesDocsLink />.
+        </Alert>
+    );
+};
+
+const DependenciesDocsLink = () => {
+    return (
+        <a
+            href='https://docs.getunleash.io/reference/dependent-features#client-sdk-support'
+            target='_blank'
+            rel='noreferrer'
+        >
+            Client SDK support for feature dependencies
+        </a>
+    );
+};