telepathy-mission-control: use Python 3.14 for build

[reneeotten]

Description

• remove redundant py-gobject dependency ; build works fine without

@dbevans I am trying to get rid of all py39-subports as that Python versions is EOL. The build lists py39-gobject as a dependency but that seems unneeded as the build works fine without. Also, the build finishes fine with Python 3.14 so use that one.

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 26.4 25E246 x86_64
Xcode 26.0.1 17A400

Verification

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• 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?

[macportsbot]

Notifying maintainers:
@dbevans for port telepathy-mission-control.