Add v1.8 migration guide

Signed-off-by: chandankumar4 <chandan.kr404@gmail.com>

docs/book/src/SUMMARY.md

@@ -97,6 +97,7 @@
           - [v1.4 to v1.5](./developer/providers/migrations/v1.4-to-v1.5.md)
           - [v1.5 to v1.6](./developer/providers/migrations/v1.5-to-v1.6.md)
           - [v1.6 to v1.7](./developer/providers/migrations/v1.6-to-v1.7.md)
+          - [v1.7 to v1.8](./developer/providers/migrations/v1.7-to-v1.8.md)
         - [Provider contracts](./developer/providers/contracts.md)
           - [Cluster Infrastructure](./developer/providers/cluster-infrastructure.md)
           - [Machine Infrastructure](./developer/providers/machine-infrastructure.md)

docs/book/src/developer/providers/migrations/v1.7-to-v1.8.md

@@ -0,0 +1,20 @@
+# Cluster API v1.7 compared to v1.8
+
+This document provides an overview over relevant changes between Cluster API v1.7 and v1.8 for
+maintainers of providers and consumers of our Go API.
+
+## Go version
+
+- The Go version used by Cluster API is Go 1.22.x
+
+## Changes by Kind
+
+### Deprecation
+
+### Removals
+
+### API Changes
+
+### Other
+
+### Suggested changes for providers