upgraded cairo compiler version used to 2.8.2 (#333)

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## Pull Request type

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Please check the type of change your PR introduces:

- [ ] Bugfix
- [X] Feature
- [ ] Code style update (formatting, renaming)
- [ ] Refactoring (no functional changes, no API changes)
- [ ] Build-related changes
- [ ] Documentation content changes
- [ ] Other (please describe):

## What is the current behavior?

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link to a relevant issue. -->
No behavior modified. Projects that use Alexandria as a dependency can't
used it if they need a cairo version above 2.7.0 as it has been
hardcoded in the TOML.
Issue Number: N/A

## What is the new behavior?

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this PR. -->

-Swithced cairo compiler version used from 2.7.0 to 2.8.2
-No changes in behaviour exept more warnings appearing due to unused
imports

## Does this introduce a breaking change?

- [ ] Yes
- [X] No

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impact and migration path for existing applications below. -->

## Other information

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.tool-versions

@@ -1 +1 @@
-scarb 2.7.0
+scarb 2.8.2

Scarb.toml

@@ -18,11 +18,11 @@ name = "alexandria"
 version = "0.1.0"
 description = "Community maintained Cairo and Starknet libraries"
 homepage = "https://github.com/keep-starknet-strange/alexandria/"
-cairo-version = "2.7.0"
+cairo-version = "2.8.2"
 
 [workspace.dependencies]
-starknet = "2.7.0"
-cairo_test = "2.7.0"
+starknet = "2.8.2"
+cairo_test = "2.8.2"
 
 [workspace.tool.fmt]
 sort-module-level-items = true