pgsql: Fix division by zero error in date_bin

Fix division by zero error in date_bin

Bauyrzhan Sakhariyev, via Github

Backpatch to v14

Branch
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REL_14_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/81322fc409743f9ef169cb7bd89b0d0113a0aaa1

Modified Files
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src/backend/utils/adt/timestamp.c         | 10 ++++++++++
src/test/regress/expected/timestamp.out   |  3 +++
src/test/regress/expected/timestamptz.out |  3 +++
src/test/regress/sql/timestamp.sql        |  3 +++
src/test/regress/sql/timestamptz.sql      |  3 +++
5 files changed, 22 insertions(+)