fix: Ensure migration lock file is closed after read

[edgarrmondragon]

No description provided.

[netlify]

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Name	Link
🔨 Latest commit	5e88505
🔍 Latest deploy log	https://app.netlify.com/sites/meltano/deploys/64e00f24dc54d300084d51e0

[codecov]

Codecov Report

Merging #8042 (5e88505) into main (5232005) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #8042   +/-   ##
=======================================
  Coverage   89.54%   89.54%           
=======================================
  Files         297      297           
  Lines       21924    21924           
  Branches     2446     2446           
=======================================
  Hits        19632    19632           
  Misses       1936     1936           
  Partials      356      356           

Files Changed	Coverage Δ
src/meltano/core/logging/output_logger.py	100.00% <100.00%> (ø)
src/meltano/core/migration_service.py	85.50% <100.00%> (ø)

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