[Dependabot]: Bump neorv32 from `9eb7ece` to `1981b40`

[dependabot[bot]]

Bumps neorv32 from 9eb7ece to 1981b40.

Commits

• 1981b40 Add COE and MEM file generator options (#904)
• eb7ad79 [docs] SW: add mem and coe makefile targets
• 0e7d784 [sw] add coe and mem makefile targets
• 91d97f4 [image_gen] add COE and MEM file output
• 1e274bf [docs] update Vivado IP UG section
• 6d7302e [rtl] minor READMEs update
• c6bb655 [AXI wrapper] minor cleanup
• 2dbd346 [docs] XBUS & SLINK: add link to AXI wrapper
• 222c8f0 Update neorv32_sdi.vhd - Minor typo correction (#903)
• 1c286e4 Update neorv32_sdi.vhd - Minor typo correction
• See full diff in compare view

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