Replace jpillora/backoff with cenkalti/backoff/v4

[Juneezee]

This is a drop-in replacement.

Both github.com/jpillora/backoff and github.com/cenkalti/backoff/v4 provide exponential backoff implementations. Since we already use github.com/cenkalti/backoff/v4 elsewhere in the codebase, this change standardizes our dependency by using a single implementation consistently.

[zachmu]

Seems fine, thanks for the contribution.

[github-actions]

@coffeegoddd DOLT

test_name	detail	row_cnt	sorted	mysql_time	sql_mult	cli_mult
batching	LOAD DATA	10000	1	0.07	1.29
batching	batch sql	10000	1	0.15	0.8
batching	by line sql	10000	1	0.1	1.2
blob	1 blob	200000	1	0.93	3.73	4.4
blob	2 blobs	200000	1	0.9	4.36	4.7
blob	no blob	200000	1	0.93	2.4	2.74
col type	datetime	200000	1	0.79	2.57	2.84
col type	varchar	200000	1	0.72	3.31	3.69
config width	2 cols	200000	1	0.85	2.36	2.66
config width	32 cols	200000	1	1.89	2.01	2.75
config width	8 cols	200000	1	0.97	2.41	2.73
pk type	float	200000	1	2.19	0.95	1.06
pk type	int	200000	1	0.86	2.38	2.63
pk type	varchar	200000	1	1.49	1.73	1.84
row count	1.6mm	1600000	1	5.59	3.06	2.99
row count	400k	400000	1	1.48	2.82	2.87
row count	800k	800000	1	2.83	2.99	2.96
secondary index	four index	200000	1	3.63	1.42	1.28
secondary index	no secondary	200000	1	0.98	2.26	2.63
secondary index	one index	200000	1	1.17	2.41	2.5
secondary index	two index	200000	1	2.08	1.73	1.79
sorting	shuffled 1mm	1000000	0	5.22	2.89	2.82
sorting	sorted 1mm	1000000	1	5.15	2.94	2.8

[github-actions]

@coffeegoddd DOLT

name	detail	mean_mult
dolt_blame_basic	system table	1.2
dolt_blame_commit_filter	system table	2.96
dolt_commit_ancestors_commit_filter	system table	0.63
dolt_commits_commit_filter	system table	1.05
dolt_diff_log_join_from_commit	system table	2.75
dolt_diff_log_join_to_commit	system table	2.75
dolt_diff_table_from_commit_filter	system table	1.11
dolt_diff_table_to_commit_filter	system table	1.12
dolt_diffs_commit_filter	system table	1.03
dolt_history_commit_filter	system table	1.25
dolt_log_commit_filter	system table	1.17

[github-actions]

@coffeegoddd DOLT

name	add_cnt	delete_cnt	update_cnt	latency
adds_only	60000	0	0	1.11
adds_updates_deletes	60000	60000	60000	4.54
deletes_only	0	60000	0	2.48
updates_only	0	0	60000	3.04