chore: Add Caleb-Hurshman as postgresqlreceiver codeowner (open-telemetry#44176)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
Adds myself (@Caleb-Hurshman) as a codeowner for the
`postgresqlreceiver`.

<!--Please delete paragraphs that you did not use before submitting.-->

Author: Caleb-Hurshman

.github/CODEOWNERS

@@ -309,7 +309,7 @@ receiver/osqueryreceiver/                                        @open-telemetry
 receiver/otelarrowreceiver/                                      @open-telemetry/collector-contrib-approvers @jmacd @moh-osman3
 receiver/otlpjsonfilereceiver/                                   @open-telemetry/collector-contrib-approvers @atoulme
 receiver/podmanreceiver/                                         @open-telemetry/collector-contrib-approvers @rogercoll
-receiver/postgresqlreceiver/                                     @open-telemetry/collector-contrib-approvers @antonblock @ishleenk17
+receiver/postgresqlreceiver/                                     @open-telemetry/collector-contrib-approvers @antonblock @ishleenk17 @Caleb-Hurshman
 receiver/pprofreceiver/                                          @open-telemetry/collector-contrib-approvers @MovieStoreGuy @atoulme
 receiver/prometheusreceiver/                                     @open-telemetry/collector-contrib-approvers @Aneurysm9 @dashpole @ArthurSens @krajorama
 receiver/prometheusremotewritereceiver/                          @open-telemetry/collector-contrib-approvers @dashpole @ArthurSens @perebaj

receiver/postgresqlreceiver/README.md

@@ -8,7 +8,7 @@
 | Distributions | [contrib] |
 | Issues        | [![Open issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aopen%20label%3Areceiver%2Fpostgresql%20&label=open&color=orange&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aopen+is%3Aissue+label%3Areceiver%2Fpostgresql) [![Closed issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aclosed%20label%3Areceiver%2Fpostgresql%20&label=closed&color=blue&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aclosed+is%3Aissue+label%3Areceiver%2Fpostgresql) |
 | Code coverage | [![codecov](https://codecov.io/github/open-telemetry/opentelemetry-collector-contrib/graph/main/badge.svg?component=receiver_postgresql)](https://app.codecov.io/gh/open-telemetry/opentelemetry-collector-contrib/tree/main/?components%5B0%5D=receiver_postgresql&displayType=list) |
-| [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@antonblock](https://www.github.com/antonblock), [@ishleenk17](https://www.github.com/ishleenk17) \| Seeking more code owners! |
+| [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@antonblock](https://www.github.com/antonblock), [@ishleenk17](https://www.github.com/ishleenk17), [@Caleb-Hurshman](https://www.github.com/Caleb-Hurshman) \| Seeking more code owners! |
 | Emeritus      | [@djaglowski](https://www.github.com/djaglowski) |
 
 [development]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/component-stability.md#development

receiver/postgresqlreceiver/metadata.yaml

@@ -7,7 +7,7 @@ status:
     development: [logs]
   distributions: [contrib]
   codeowners:
-    active: [antonblock, ishleenk17]
+    active: [antonblock, ishleenk17, Caleb-Hurshman]
     seeking_new: true
     emeritus: [djaglowski]