Upgrade to cairo 2.6.3 (#287)

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## Pull Request type

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- [ ] Bugfix
- [ ] Feature
- [ ] Code style update (formatting, renaming)
- [ ] Refactoring (no functional changes, no API changes)
- [ x] Build-related changes
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## What is the current behavior?

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Issue Number: N/A

## What is the new behavior?

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- Updated scarb.toml file for practicality as other repositories passed
to the latest version also and it doesn't require any change in the code

## Does this introduce a breaking change?

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- [x] No

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.tool-versions

@@ -1 +1 @@
-scarb 2.6.0
+scarb 2.6.3

Scarb.toml

@@ -17,10 +17,10 @@ name = "alexandria"
 version = "0.1.0"
 description = "Community maintained Cairo and Starknet libraries"
 homepage = "https://github.com/keep-starknet-strange/alexandria/"
-cairo-version = "2.6.0"
+cairo-version = "2.6.3"
 
 [workspace.dependencies]
-starknet = "=2.6.0"
+starknet = "2.6.3"
 
 [workspace.tool.fmt]
 sort-module-level-items = true