fix: do not allow decreasing depth in getExtensionCost

[Cafe137]

No description provided.

[github-actions]

File	Coverage Now	Coverage Before	Delta%	Rating
Total	2028 / 2478	2028 / 2478	0.00
bee-dev.ts	5 / 14	5 / 14	0.00
bee.ts	370 / 445	370 / 445	0.00
index.ts	16 / 16	16 / 16	0.00
chunk/bmt.ts	15 / 16	15 / 16	0.00
chunk/cac.ts	19 / 21	19 / 21	0.00
chunk/soc.ts	60 / 61	60 / 61	0.00
feed/identifier.ts	5 / 5	5 / 5	0.00
feed/index.ts	82 / 84	82 / 84	0.00
feed/retrievable.ts	18 / 19	18 / 19	0.00
manifest/manifest.ts	213 / 228	213 / 228	0.00
modules/bytes.ts	20 / 25	20 / 25	0.00
modules/bzz.ts	30 / 31	30 / 31	0.00
modules/chunk.ts	14 / 14	14 / 14	0.00
modules/envelope.ts	7 / 7	7 / 7	0.00
modules/feed.ts	22 / 24	22 / 24	0.00
modules/grantee.ts	21 / 21	21 / 21	0.00
modules/gsoc.ts	10 / 11	10 / 11	0.00
modules/pinning.ts	19 / 20	19 / 20	0.00
modules/pss.ts	11 / 12	11 / 12	0.00
modules/rchash.ts	5 / 7	5 / 7	0.00
modules/soc.ts	10 / 10	10 / 10	0.00
modules/status.ts	5 / 10	5 / 10	0.00
modules/stewardship.ts	11 / 11	11 / 11	0.00
modules/tag.ts	19 / 20	19 / 20	0.00
modules/debug/balance.ts	26 / 26	26 / 26	0.00
modules/debug/chequebook.ts	40 / 58	40 / 58	0.00
modules/debug/connectivity.ts	28 / 35	28 / 35	0.00
modules/debug/settlements.ts	18 / 18	18 / 18	0.00
modules/debug/stake.ts	21 / 32	21 / 32	0.00
modules/debug/stamps.ts	60 / 70	60 / 70	0.00
modules/debug/states.ts	24 / 29	24 / 29	0.00
modules/debug/status.ts	34 / 36	34 / 36	0.00
modules/debug/transactions.ts	18 / 27	18 / 27	0.00
stamper/stamper.ts	21 / 21	21 / 21	0.00
types/debug.ts	8 / 12	8 / 12	0.00
types/index.ts	21 / 21	21 / 21	0.00
utils/bytes.ts	41 / 53	41 / 53	0.00
utils/chunk-size.ts	9 / 9	9 / 9	0.00
utils/chunk-stream.browser.ts	0 / 55	0 / 55	0.00
utils/chunk-stream.ts	57 / 63	57 / 63	0.00
utils/cid.ts	22 / 23	22 / 23	0.00
utils/collection.browser.ts	0 / 4	0 / 4	0.00
utils/collection.node.ts	29 / 33	29 / 33	0.00
utils/collection.ts	14 / 18	14 / 18	0.00
utils/constants.ts	7 / 7	7 / 7	0.00
utils/data.browser.ts	0 / 8	0 / 8	0.00
utils/data.ts	4 / 11	4 / 11	0.00
utils/duration.ts	20 / 22	20 / 22	0.00
utils/error.ts	12 / 12	12 / 12	0.00
utils/expose.ts	13 / 13	13 / 13	0.00
utils/file.ts	8 / 12	8 / 12	0.00
utils/headers.ts	62 / 71	62 / 71	0.00
utils/http.ts	32 / 37	32 / 37	0.00
utils/mime.ts	1 / 1	1 / 1	0.00
utils/pss.ts	5 / 5	5 / 5	0.00
utils/redundancy.ts	32 / 44	32 / 44	0.00
utils/resource-locator.ts	7 / 7	7 / 7	0.00
utils/size.ts	12 / 14	12 / 14	0.00
utils/stamps.ts	45 / 63	45 / 63	0.00
utils/tar-uploader.browser.ts	0 / 11	0 / 11	0.00
utils/tar-uploader.ts	12 / 12	12 / 12	0.00
utils/tar-writer.browser.ts	0 / 8	0 / 8	0.00
utils/tar-writer.ts	13 / 14	13 / 14	0.00
utils/tar.browser.ts	0 / 40	0 / 40	0.00
utils/tar.ts	36 / 39	36 / 39	0.00
utils/tokens.ts	24 / 37	24 / 37	0.00
utils/type.ts	78 / 100	78 / 100	0.00
utils/typed-bytes.ts	85 / 86	85 / 86	0.00
utils/url.ts	11 / 15	11 / 15	0.00
utils/workaround.ts	11 / 14	11 / 14	0.00