chore: bump to v1.9.1

chore(main): release 1.8.0 (CopilotC-Nvim#68)

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Last Stable Release

chore(main): release 1.7.1 (CopilotC-Nvim#62)

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chore(main): release 1.7.0 (CopilotC-Nvim#61)

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chore(main): release 1.6.2 (CopilotC-Nvim#59)

chore(main): release 1.6.1 (CopilotC-Nvim#53)

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chore(main): release 1.6.0 (CopilotC-Nvim#52)

chore(main): release 1.5.0 (CopilotC-Nvim#50)

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chore(main): release 1.4.0 (CopilotC-Nvim#49)