deps: update actions/checkout digest to a5ac7e5 #1149

Job	Run time	Billable time
build (8, java-bigquery, test)	2m 28s	0s
javadoc-with-doclet (java-bigtable)	1m 15s	0s
build (8, java-bigquery, lint)	53s	0s
javadoc-with-doclet (java-bigquery)	1m 7s	0s
build (8, java-bigquery, clirr)	58s	0s
javadoc-with-doclet (java-storage)	1m 16s	0s
build (8, java-bigquery, javadoc)	1m 3s	0s
javadoc-with-doclet (java-storage-nio)	52s	0s
build (8, java-bigquery, javadoc-with-doclet)	46s	0s
javadoc-with-doclet (java-spanner)	1m 19s	0s
build (8, java-bigtable, test)	2m 52s	0s
javadoc-with-doclet (java-spanner-jdbc)	1m 6s	0s
build (8, java-bigtable, lint)	1m 18s	0s
javadoc-with-doclet (java-pubsub)	57s	0s
build (8, java-bigtable, clirr)	1m 31s	0s
javadoc-with-doclet (java-pubsublite)	1m 20s	0s
build (8, java-bigtable, javadoc)	2m 1s	0s
javadoc-with-doclet (java-logging)	1m 2s	0s
build (8, java-bigtable, javadoc-with-doclet)	1m 4s	0s
javadoc-with-doclet (java-logging-logback)	49s	0s
build (11, java-bigquery, test)	2m 20s	0s
javadoc-with-doclet (java-firestore)	1m 27s	0s
build (11, java-bigquery, lint)	1m 8s	0s
javadoc-with-doclet (java-datastore)	1m 35s	0s
build (11, java-bigquery, clirr)	1m 6s	0s
javadoc-with-doclet (java-bigquerystorage)	1m 14s	0s
build (11, java-bigquery, javadoc)	1m 9s	0s
build (11, java-bigquery, javadoc-with-doclet)	53s	0s
build (11, java-bigtable, test)	3m 0s	0s
build (11, java-bigtable, lint)	1m 28s	0s
build (11, java-bigtable, clirr)	1m 45s	0s
build (11, java-bigtable, javadoc)	2m 23s	0s
build (11, java-bigtable, javadoc-with-doclet)	1m 18s	0s
	46m 43s	0s

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