Reference only the runner name [OI-1830] (#1416)

# Description

@swift-nav/devinfra

The Benchamarks Action has been failing since June 18th.
The last [successful
run](https://github.com/swift-nav/libsbp/actions/runs/9542331732) of
Benchmarks contains the following warning
```
Found multiple labels in this runner. Support for multiple labels on Larger Runners will be removed after June 17th, 2024. Please visit changelog for the brownouts and more details: https://github.blog/changelog/2024-05-16-new-dates-for-actions-larger-runner-multi-label-deprecation/.
```
[Later
runs](https://github.com/swift-nav/libsbp/actions/runs/9573895846) start
showing that no runners are picking up the job.

In this PR I'm changing the use of labels and instead only using the
runner name. I have obtained that info from
[here](https://github.com/swift-nav/libsbp/actions/runners).

# API compatibility

Does this change introduce a API compatibility risk?

No, it only updates a github workflow file

## API compatibility plan

If the above is "Yes", please detail the compatibility (or migration)
plan:

<!-- Provide a short explanation plan here -->

# JIRA Reference

https://swift-nav.atlassian.net/browse/OI-1830

.github/workflows/benchmark.yaml

@@ -21,7 +21,7 @@ on:
 jobs:
   benchmark:
     name: Benchmark
-    runs-on: [linux, xlarge]
+    runs-on: [xlarge]
     steps:
       - uses: actions/checkout@v2
       - name: Setup

rust/Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.65-slim-buster
+FROM rust:1.67.1-slim-buster
 
 ARG DEBIAN_FRONTEND=noninterative