Update Rust crate indoc to 2.0.4 #291

Job	Run time
Cross-compile to aarch64	2m 20s
Build and test core crates (ubuntu-latest, 1.66)	3m 54s
Build and test core crates (ubuntu-latest, stable)	3m 54s
Build and test (all features) (ubuntu-latest, 1.66)	5m 30s
Build and test core crates (macos-latest, 1.66)	5m 22s
Build documentation (ubuntu-latest)	1m 49s
Build and test (all features) (ubuntu-latest, stable)	3m 57s
Build and test core crates (macos-latest, stable)	4m 25s
Build and test (all features) (macos-latest, 1.66)	4m 26s
Build and test core crates (windows-latest, 1.66)	7m 4s
Lint	1m 11s
Build and test core crates (windows-latest, stable)	7m 15s
Build and test (all features) (macos-latest, stable)	8m 43s
Build and test (all features) (windows-latest, 1.66)	10m 8s
Build and test (all features) (windows-latest, stable)	10m 55s
cargo-compare extended tests (ubuntu-latest)	2m 8s
cargo-compare extended tests (macos-latest)	2m 26s
	1h 25m 27s

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