Description:
This PR updates the bundled Terraform binary and related version pins
from 1.14.1 to 1.14.5 (base image, installer fallback, and CI/test
fixtures). Terraform is statically built with an embedded Go runtime.
Moving to 1.14.5 updates the embedded toolchain and is intended to
address Go stdlib CVEs reported by security scanning.

Notes:
- Change is version-only; no functional Coder logic changes.
- Backport-friendly: intended to be cherry-picked to release branches
after merge.

(cherry picked from commit 4c0c621)