ngspice: update to version 44.2

[bpdegnan]

Description

• Updated ngspice to version 44.2
• Modified the Portfile to handle the "." of the version.

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 13.7.2 22H313 x86_64
Xcode 14.3.1 14E300c

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL in commit message?
• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

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