Fix MBID Mapping Lookup element

[amCap1712]

Remove year field no longer returned by the API and add missing artist_mbids field.

[github-actions]

Test Results

  4 files  ±0    4 suites  ±0   4s ⏱️ ±0s
 56 tests ±0   56 ✅ ±0  0 💤 ±0  0 ❌ ±0 
224 runs  ±0  224 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 064ae1b. ± Comparison against base commit 08ff8d9.

[github-actions]

Package	Line Rate	Complexity	Health
.	35%	0	❌
content_resolver	0%	0	❌
content_resolver.formats	6%	0	❌
content_resolver.model	0%	0	❌
listenbrainz	41%	0	❌
musicbrainz	74%	0	➖
patches	32%	0	❌
patches.lb_radio_classes	0%	0	❌
tools	76%	0	✔
.	35%	0	❌
content_resolver	0%	0	❌
content_resolver.formats	6%	0	❌
content_resolver.model	0%	0	❌
listenbrainz	41%	0	❌
musicbrainz	74%	0	➖
patches	32%	0	❌
patches.lb_radio_classes	0%	0	❌
tools	76%	0	✔
.	35%	0	❌
content_resolver	0%	0	❌
content_resolver.formats	6%	0	❌
content_resolver.model	0%	0	❌
listenbrainz	41%	0	❌
musicbrainz	74%	0	➖
patches	32%	0	❌
patches.lb_radio_classes	0%	0	❌
tools	76%	0	✔
.	35%	0	❌
content_resolver	0%	0	❌
content_resolver.formats	6%	0	❌
content_resolver.model	0%	0	❌
listenbrainz	41%	0	❌
musicbrainz	74%	0	➖
patches	32%	0	❌
patches.lb_radio_classes	0%	0	❌
tools	76%	0	✔
Summary	26% (5080 / 19749)	0	❌