FIX: Remove duplicate version declaration for source-gitlab

[bnchrch]

What

Removes the previous docker version which was forgotten:
01b1673

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[bnchrch]

/test connector="connectors/source-gitlab"

🕑 connectors/source-gitlab https://github.com/airbytehq/airbyte/actions/runs/5085137915
✅ connectors/source-gitlab https://github.com/airbytehq/airbyte/actions/runs/5085137915
Python tests coverage:

Name                        Stmts   Miss  Cover
-----------------------------------------------
source_gitlab/__init__.py       2      0   100%
source_gitlab/source.py        61      3    95%
source_gitlab/streams.py      281     15    95%
-----------------------------------------------
TOTAL                         344     18    95%

Build Passed

Test summary info:

=========================== short test summary info ============================
SKIPPED [1] ../usr/local/lib/python3.9/site-packages/connector_acceptance_test/tests/test_core.py:100: The previous and actual specifications are identical.
SKIPPED [1] ../usr/local/lib/python3.9/site-packages/connector_acceptance_test/tests/test_core.py:578: The previous and actual discovered catalogs are identical.
================== 43 passed, 2 skipped in 543.94s (0:09:03) ===================

[bnchrch]

/approve-and-merge reason="remove version"

[octavia-approvington]

All in!!