Closes #12964: Raise minimum PostgreSQL version from 11 to 12

docs/installation/1-postgresql.md

@@ -2,8 +2,8 @@
 
 This section entails the installation and configuration of a local PostgreSQL database. If you already have a PostgreSQL database service in place, skip to [the next section](2-redis.md).
 
-!!! warning "PostgreSQL 11 or later required"
-    NetBox requires PostgreSQL 11 or later. Please note that MySQL and other relational databases are **not** supported.
+!!! warning "PostgreSQL 12 or later required"
+    NetBox requires PostgreSQL 12 or later. Please note that MySQL and other relational databases are **not** supported.
 
 ## Installation
 
@@ -35,7 +35,7 @@ This section entails the installation and configuration of a local PostgreSQL da
     sudo systemctl enable postgresql
     ```
 
-Before continuing, verify that you have installed PostgreSQL 11 or later:
+Before continuing, verify that you have installed PostgreSQL 12 or later:
 
 ```no-highlight
 psql -V

docs/installation/index.md

@@ -18,7 +18,7 @@ The following sections detail how to set up a new instance of NetBox:
 | Dependency | Minimum Version |
 |------------|-----------------|
 | Python     | 3.8             |
-| PostgreSQL | 11              |
+| PostgreSQL | 12              |
 | Redis      | 4.0             |
 
 Below is a simplified overview of the NetBox application stack for reference:

docs/installation/upgrading.md

@@ -15,12 +15,12 @@ Prior to upgrading your NetBox instance, be sure to carefully review all [releas
 
 ## 2. Update Dependencies to Required Versions
 
-NetBox v3.0 and later require the following:
+NetBox requires the following dependencies:
 
 | Dependency | Minimum Version |
 |------------|-----------------|
 | Python     | 3.8             |
-| PostgreSQL | 11              |
+| PostgreSQL | 12              |
 | Redis      | 4.0             |
 
 ## 3. Install the Latest Release