New date macro (#5472)

## What are you changing in this pull request and why?

For dbt Core 1.8, add new `date` macro to the page
https://docs.getdbt.com/reference/dbt-jinja-functions/cross-database-macros

closes #5427 

## Checklist
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
so my content adheres to these guidelines.
- [ ] For [docs
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#about-versioning),
review how to [version a whole
page](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
and [version a block of
content](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#versioning-blocks-of-content).
- [x] Needs review from DX team

website/docs/reference/dbt-jinja-functions/cross-database-macros.md

@@ -58,6 +58,7 @@ Please make sure to take a look at the [SQL expressions section](#sql-expression
     - [cast\_bool\_to\_text](#cast_bool_to_text)
     - [safe\_cast](#safe_cast)
   - [Date and time functions](#date-and-time-functions)
+    - [date](#date)
     - [dateadd](#dateadd)
     - [datediff](#datediff)
     - [date\_trunc](#date_trunc)
@@ -106,6 +107,7 @@ Please make sure to take a look at the [SQL expressions section](#sql-expression
     - [cast\_bool\_to\_text](#cast_bool_to_text)
     - [safe\_cast](#safe_cast)
   - [Date and time functions](#date-and-time-functions)
+    - [date](#date)
     - [dateadd](#dateadd)
     - [datediff](#datediff)
     - [date\_trunc](#date_trunc)
@@ -176,6 +178,7 @@ Please make sure to take a look at the [SQL expressions section](#sql-expression
 - [safe_cast](#safe_cast)
 
 [**Date and time functions**](#date-and-time-functions)
+- [date](#date)
 - [dateadd](#dateadd)
 - [datediff](#datediff)
 - [date_trunc](#date_trunc)
@@ -884,6 +887,35 @@ For databases that support it, this macro will return `NULL` when the cast fails
 
 ## Date and time functions
 
+### date
+
+**Availability**:
+dbt v1.8 or later. For more information, select the version from the documentation navigation menu.
+
+<VersionBlock firstVersion="1.8">
+
+__Args__:
+
+ * `year`: an integer
+ * `month`: an integer
+ * `day`: an integer
+
+This macro converts the `year`, `month`, and `day` into an SQL `DATE` type.
+
+**Usage**:
+
+```sql
+{{ dbt.date(2023, 10, 4) }}
+```
+
+**Sample output (PostgreSQL)**:
+
+```sql
+to_date('2023-10-04', 'YYYY-MM-DD')
+```
+
+</VersionBlock>
+
 ### dateadd
 __Args__: