Update dependency @actions/github to v6

[openverse-bot]

This PR contains the following updates:

Package	Type	Update	Change
@actions/github (source)	devDependencies	major	^5.1.1 -> ^6.0.0

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Release Notes

actions/toolkit (@​actions/github)

### [`v6.0.0`](https://redirect.github.com/actions/toolkit/blob/HEAD/packages/github/RELEASES.md#600) - Support the latest Octokit in [@​actions/github](https://redirect.github.com/actions/github) [#​1553](https://redirect.github.com/actions/toolkit/pull/1553) - Drop support of NodeJS v14, v16

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Configuration

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This PR has been generated by Renovate Bot.

[github-actions[bot]]

Latest k6 run output[^update]

     ✓ status was 200

     checks.........................: 100.00% ✓ 8000      ✗ 0   
     data_received..................: 1.9 GB  8.5 MB/s
     data_sent......................: 1.0 MB  4.8 kB/s
     http_req_blocked...............: avg=31.65µs  min=2.07µs  med=3.97µs   max=19.62ms p(90)=5.45µs   p(95)=5.87µs 
     http_req_connecting............: avg=27.16µs  min=0s      med=0s       max=19.59ms p(90)=0s       p(95)=0s     
     http_req_duration..............: avg=566.99ms min=54.52ms med=510.48ms max=2.6s    p(90)=1.05s    p(95)=1.18s  
       { expected_response:true }...: avg=566.99ms min=54.52ms med=510.48ms max=2.6s    p(90)=1.05s    p(95)=1.18s  
   ✓ http_req_failed................: 0.00%   ✓ 0         ✗ 8000
     http_req_receiving.............: avg=137.21µs min=42.66µs med=112.71µs max=15.25ms p(90)=177.56µs p(95)=216.9µs
     http_req_sending...............: avg=23.03µs  min=7.07µs  med=19.32µs  max=15.05ms p(90)=24.9µs   p(95)=27.33µs
     http_req_tls_handshaking.......: avg=0s       min=0s      med=0s       max=0s      p(90)=0s       p(95)=0s     
     http_req_waiting...............: avg=566.83ms min=54.42ms med=510.33ms max=2.6s    p(90)=1.05s    p(95)=1.17s  
     http_reqs......................: 8000    36.525531/s
     iteration_duration.............: avg=3.78s    min=1.19s   med=3.34s    max=11.73s  p(90)=8.19s    p(95)=8.71s  
     iterations.....................: 1200    5.47883/s
     vus............................: 3       min=3       max=30
     vus_max........................: 30      min=30      max=30

[^update]: This comment will automatically update with new output each time k6 runs for this PR