Fix and Update CI Regular Expression

[mfleader]

Changes introduced with this PR

Update the version format regular expression to include potential pre-release and/or build identifiers as in the semantic versioning 2.0.0 specification.

<valid semver> ::= <version core>
                 | <version core> "-" <pre-release>
                 | <version core> "+" <build>
                 | <version core> "-" <pre-release> "+" <build>

<version core> ::= <major> "." <minor> "." <patch>

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[jaredoconnell]

This is more strict than we've been doing, but that's okay. Approved.