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GH-49727: [CI] Pin GitHub Actions to commit SHAs instead of tags #1992

Job	Run time
check-labels / Check labels	27s
Rocker R-ver - Minimal	14m 22s
Rhub GCC 12	33m 13s
Rhub GCC 13 with LTO	2m 2s
Rhub	28m 56s
RStudio R-Base 4.2	23m 48s
Rocker R-ver - Bundled Dependencies	28m 17s
Rocker R-ver - Offline build	14m 47s
Rocker R-ver	27m 54s
report-extra-cpp	0s
	2h 53m 46s