packaging: Bump Singer SDK to v0.44 #1130

Job	Run time
Meltano integration test / COPY	55s
Python 3.13 / Postgres 17 / COPY	1m 24s
Meltano integration test / INSERT	57s
Python 3.12 / Postgres 17 / COPY	1m 13s
Python 3.11 / Postgres 17 / COPY	1m 19s
Python 3.10 / Postgres 17 / COPY	1m 23s
Python 3.9 / Postgres 17 / COPY	1m 22s
Python 3.13 / Postgres 13 / COPY	1m 26s
Python 3.13 / Postgres 14 / COPY	1m 28s
Python 3.13 / Postgres 15 / COPY	1m 23s
Python 3.13 / Postgres 16 / COPY	1m 24s
Python 3.13 / Postgres 17 / INSERT	1m 23s
	15m 37s

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