Don't install prerelease dbt Core

[pgoslatara]

Resolves #

Problem

Solution

Checklist

• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
src/dbt_bouncer
config_file_validator.py	95	2	98%	138, 144
runner.py	76	4	95%	131, 167–168, 226
utils.py	101	19	81%	42, 47, 136–154, 177
src/dbt_bouncer/artifact_parsers
parsers_common.py	48	1	98%	61
parsers_manifest.py	86	4	95%	176, 178, 186, 261
parsers_run_results.py	34	3	91%	66, 68, 71
src/dbt_bouncer/checks/manifest
check_models.py	199	1	99%	533
check_unit_tests.py	47	3	94%	102, 153, 205
src/dbt_bouncer/checks/run_results
check_run_results.py	19	2	89%	92–93
TOTAL	3946	39	99%

Tests	Skipped	Failures	Errors	Time
1	0 💤	0 ❌	0 🔥	8.262s ⏱️