Fix: Add missing lifetime bounds to Executor trait #7

Job	Run time
clippy (sqlx-oldapi) • runtime-async-std-rustls,postgres,macros	2m 30s
clippy (sqlx-rt-oldapi) • runtime-async-std-rustls	1m 1s
clippy (sqlx-oldapi) • runtime-tokio-rustls,mysql,macros	2m 28s
clippy (sqlx-core-oldapi) • postgres • runtime-tokio-rustls	1m 22s
clippy (sqlx-oldapi) • runtime-tokio-rustls,sqlite,macros	2m 19s
clippy (sqlx-rt-oldapi) • runtime-async-std-native-tls	38s
clippy (sqlx-rt-oldapi) • runtime-tokio-native-tls	31s
clippy (sqlx-rt-oldapi) • runtime-tokio-rustls	30s
clippy (sqlx-oldapi) • runtime-tokio-rustls,postgres,macros	2m 21s
clippy (sqlx-core-oldapi) • mysql • runtime-tokio-rustls	1m 14s
clippy (sqlx-core-oldapi) • sqlite • runtime-tokio-rustls	1m 11s
clippy (sqlx-core-oldapi) • any • runtime-tokio-rustls	1m 14s
clippy (sqlx-core-oldapi) • mssql • runtime-tokio-rustls	1m 23s
	18m 42s

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