[Security] Update CI workflow to use latest Ubuntu

[definfo]

Problem

The current Linux bundling workflow (.github/workflows/release.yml) uses ubuntu-20.04. This environment ships with OpenSSL 1.1.1, which reached end-of-life (EOL) on September 11, 2023. Using unmaintained dependencies poses security risks due to unresolved vulnerabilities.

Proposed Solution

Update all instances of ubuntu-20.04 to ubuntu-latest in .github/workflows/release.yml.

ubuntu-latest resolves to ubuntu-24.04 or newer, which includes OpenSSL 3.0+ (actively maintained).

Example change:

- runs-on: ubuntu-20.04
+ runs-on: ubuntu-latest