Update libsbp codeowners [AP-2193] (#1427)

# Description

@swift-nav/devinfra

Updates the codeowners file and PR description template according to the
Swift Tool Matrix.

# API compatibility

✅ no compatibility risk

# JIRA Reference

https://swift-nav.atlassian.net/browse/AP-2193

Author: reimerix

.github/CODEOWNERS

@@ -1,6 +1,6 @@
 # DevInfra team is default owner of anything in the repo.
-* @swift-nav/devinfra
-/rust @notoriaga @pcrumley @isaactorz
-/c @swift-nav/algint-team @isaactorz
+* @swift-nav/algint-team
+/rust @notoriaga @pcrumley
+/c @swift-nav/algint-team
 
 # Add new codeowners above here

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,6 +1,6 @@
 # Description
 
-@swift-nav/devinfra
+@swift-nav/algint-team
 
 <!-- Changes proposed in this PR -->