fix(ci): use POSIX ERE capturing group in semver regex validation

[utkarsh232005]

This PR fixes the semver tag regex in release.yml by replacing the non-capturing group (?:...) with a standard capturing group. Bash's =~ operator uses POSIX Extended Regular Expressions (ERE) which does not support non-capturing groups, causing valid tags like v1.0.0 to fail validation.

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