add action to close stale issues and PRs #735

Job	Run time
Build docs	49s
cargo-deny	24s
set-rust-versions	6s
Cargo fmt and clippy	1m 4s
Test tokio-postgres (nightly)	59s
Test tokio-postgres (stable)	52s
Test tokio-postgres (1.85)	1m 1s
Test postgres (nightly)	1m 57s
Test postgres (1.85)	2m 6s
Test Sqlite (1.85)	2m 21s
Test postgres (stable)	2m 0s
Test Sqlite (nightly)	2m 28s
Test Sqlite (stable)	2m 21s
test-macros-and-cli (stable, ubuntu-latest)	1m 33s
Test mysql-async (stable)	1m 6s
test-macros-and-cli (nightly, ubuntu-latest)	1m 33s
Test mysql (nightly)	2m 16s
test-macros-and-cli (1.85, windows-latest)	3m 20s
Test mysql (1.85)	2m 10s
test-macros-and-cli (nightly, windows-latest)	3m 30s
test-macros-and-cli (stable, windows-latest)	4m 46s
Test mysql (stable)	2m 8s
Test mysql-async (1.85)	1m 29s
test-macros-and-cli (1.85, ubuntu-latest)	1m 40s
Test mysql-async (nightly)	1m 11s
Test tiberius (1.85)	2m 32s
Test tiberius (stable)	2m 17s
Test tiberius (nightly)	2m 21s
CI is green	4s
	52m 24s

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