pgsql: Fix typo in test file name added in commit 4909b38af0.

Fix typo in test file name added in commit 4909b38af0.

Author: Shlok Kyal <shlok.kyal.oss@gmail.com>
Backpatch-through: 13
Discussion: https://postgr.es/m/CANhcyEXsObdjkjxEnq10aJumDpa5J6aiPzgTh_w4KCWRYHLw6Q@mail.gmail.com

Branch
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REL_17_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/d96206f259d6799de066c6fa88a4b51c494f7167

Modified Files
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contrib/test_decoding/Makefile                                          | 2 +-
.../{invalidation_distrubution.out => invalidation_distribution.out}    | 0
contrib/test_decoding/meson.build                                       | 2 +-
.../{invalidation_distrubution.spec => invalidation_distribution.spec}  | 0
4 files changed, 2 insertions(+), 2 deletions(-)