fix: Fix Dockerfile.gaia not pulling the latest version

[p-offtermatt]

Description

Closes: N/A

Dockerfile.gaia is not pulling the latest version, contrary to what it claims in the comment.
The current line sorts by lexicographic order, i.e.

 $ git tag
stargate-6
stargate-6-a
stargate-6-b
v0.0.0
v0.0.1-rc0
v1.0.0
v1.0.0-rc1
v1.0.0-rc2
v1.0.0-rc3
v10.0.0
v10.0.0-rc0
v10.0.1
v10.0.2
v11.0.0
v11.0.0-rc0
v12.0.0
v12.0.0-rc0
v13.0.0
v13.0.0-rc0
v13.0.1
v2.0.0
v2.0.0-rc1
v2.0.1
v2.0.10
v2.0.11
v2.0.12
v2.0.13
v2.0.14
v2.0.15
v2.0.2
v2.0.3
v2.0.4
v2.0.5
v2.0.6
v2.0.7
v2.0.8
v2.0.9
v3.0.0
v3.0.1
v4.0.0
v4.0.1
v4.0.2
v4.0.3
v4.0.4
v4.0.5
v4.0.6
v4.1.0
v4.1.1
v4.1.2
v4.2.0
v4.2.1
v5.0.0
v5.0.1
v5.0.2
v5.0.3
v5.0.4
v5.0.5
v5.0.6
v5.0.7
v5.0.8
v6.0.0
v6.0.0-rc1
v6.0.0-rc2
v6.0.0-rc3
v6.0.1
v6.0.2
v6.0.3
v6.0.4
v7.0.0
v7.0.0-rc0
v7.0.1
v7.0.2
v7.0.3
v7.1.0
v7.1.1
v8.0.0
v8.0.0-rc
v8.0.0-rc1
v8.0.0-rc2
v8.0.0-rc3
v8.0.0-rc4
v8.0.0-rc5
v8.0.1
v9.0.0
v9.0.0-rc0
v9.0.0-rc1
v9.0.0-rc2
v9.0.0-rc3
v9.0.0-rc4
v9.0.0-rc5
v9.0.0-rc6
v9.0.0-rc7
v9.0.1
v9.0.1-rc0
v9.0.2
v9.0.2-rc0
v9.0.3
v9.0.3-rc0
v9.1.0
v9.1.1

Thus, this tries to build v9.1.1.

The adjusted sorting actually sorts correctly (though it is reversed in order now, which is why we take head instead of tail).

% git tag | sort -Vr           
v13.0.1
v13.0.0-rc0
v13.0.0
v12.0.0-rc0
v12.0.0
v11.0.0-rc0
v11.0.0
v10.0.2
v10.0.1
v10.0.0-rc0
v10.0.0
v9.1.1
v9.1.0
v9.0.3-rc0
v9.0.3
v9.0.2-rc0
v9.0.2
v9.0.1-rc0
v9.0.1
v9.0.0-rc7
v9.0.0-rc6
v9.0.0-rc5
v9.0.0-rc4
v9.0.0-rc3
v9.0.0-rc2
v9.0.0-rc1
v9.0.0-rc0
v9.0.0
v8.0.1
v8.0.0-rc5
v8.0.0-rc4
v8.0.0-rc3
v8.0.0-rc2
v8.0.0-rc1
v8.0.0-rc
v8.0.0
v7.1.1
v7.1.0
v7.0.3
v7.0.2
v7.0.1
v7.0.0-rc0
v7.0.0
v6.0.4
v6.0.3
v6.0.2
v6.0.1
v6.0.0-rc3
v6.0.0-rc2
v6.0.0-rc1
v6.0.0
v5.0.8
v5.0.7
v5.0.6
v5.0.5
v5.0.4
v5.0.3
v5.0.2
v5.0.1
v5.0.0
v4.2.1
v4.2.0
v4.1.2
v4.1.1
v4.1.0
v4.0.6
v4.0.5
v4.0.4
v4.0.3
v4.0.2
v4.0.1
v4.0.0
v3.0.1
v3.0.0
v2.0.15
v2.0.14
v2.0.13
v2.0.12
v2.0.11
v2.0.10
v2.0.9
v2.0.8
v2.0.7
v2.0.6
v2.0.5
v2.0.4
v2.0.3
v2.0.2
v2.0.1
v2.0.0-rc1
v2.0.0
v1.0.0-rc3
v1.0.0-rc2
v1.0.0-rc1
v1.0.0
v0.0.1-rc0
v0.0.0
stargate-6-b
stargate-6-a
stargate-6
stargate-4
stargate-3
stargate-2
stargate-1a
stargate-1
list
goz-phase-3
goz-phase-2
goz-phase-1
cosmoshub-test-stargate-e
cosmoshub-test-stargate-2
cosmoshub-test-stargate

Neither the new nor the old version handle the random tags flying around very well,
so I think the change shouldn't make anything worse in that (and we avoid problems with this by keeping our tags neat in the future).

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[MSalopek]

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