Bump async from 2.6.3 to 2.6.4 in /scripts/joystream-leaderboard-bot (#760)

Bumps [async](https://github.com/caolan/async) from 2.6.3 to 2.6.4.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md)
- [Commits](https://github.com/caolan/async/compare/v2.6.3...v2.6.4)

---
updated-dependencies:
- dependency-name: async
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

scripts/joystream-leaderboard-bot/package-lock.json

@@ -1193,9 +1193,9 @@
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@@ -1880,9 +1880,9 @@
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@@ -1903,9 +1903,9 @@
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@@ -3320,9 +3320,9 @@
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@@ -3393,9 +3393,9 @@
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@@ -3638,9 +3638,9 @@
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@@ -3801,9 +3801,9 @@
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@@ -4273,9 +4273,9 @@
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@@ -8877,9 +8877,9 @@
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+      "version": "3.2.3",
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@@ -9435,9 +9435,9 @@
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@@ -9460,9 +9460,9 @@
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@@ -10571,9 +10571,9 @@
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@@ -10681,9 +10681,9 @@
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@@ -10853,9 +10853,9 @@
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@@ -10987,9 +10987,9 @@
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@@ -11147,9 +11147,9 @@
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