Add 4.0 entry to version table.

Author: jackorp

README.md

@@ -23,6 +23,7 @@ Table start
 |2.5||||<details><summary>✓</summary>`registry.redhat.io/rhel8/ruby-25`</details>|||
 |3.0|||||<details><summary>✓</summary>`registry.redhat.io/rhel9/ruby-30`</details>||
 |3.3||<details><summary>✓</summary>`quay.io/sclorg/ruby-33-c10s`</details>|<details><summary>✓</summary>`quay.io/fedora/ruby-33`</details>|<details><summary>✓</summary>`registry.redhat.io/rhel8/ruby-33`</details>|<details><summary>✓</summary>`registry.redhat.io/rhel9/ruby-33`</details>|<details><summary>✓</summary>`registry.redhat.io/rhel10/ruby-33`</details>|
+|4.0||<details><summary>✓</summary>`quay.io/sclorg/ruby-40-c10s`</details>|<details><summary>✓</summary>`quay.io/fedora/ruby-40`</details>||<details><summary>✓</summary>`registry.redhat.io/rhel9/ruby-40`</details>|<details><summary>✓</summary>`registry.redhat.io/rhel10/ruby-40`</details>|
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