doc: Updates Terraform Compatibility Matrix documentation (#3449)

Co-authored-by: maastha <[email protected]>

Author: svc-apix-Bot

docs/index.md

@@ -186,7 +186,6 @@ For more information on configuring and managing programmatic API Keys see the [
 | 1.8.x | 2024-04-10 | 2026-04-30 | 2026-04-30 |
 | 1.7.x | 2024-01-17 | 2026-01-31 | 2026-01-31 |
 | 1.6.x | 2023-10-04 | 2025-10-31 | 2025-10-31 |
-| 1.5.x | 2023-06-12 | 2025-06-30 | 2025-06-30 |
 <!-- MATRIX_PLACEHOLDER_END -->
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