Upgrade python to 3.10

[palango]

Description

A few sentences describing the overall effects and goals of the pull request's commits.
What is the current behavior, and what is the updated/expected behavior with this PR?

Other changes

Describe any minor or "drive-by" changes here.

Tested

An explanation of how the changes were tested or an explanation as to why they don't need to be.

Related issues

• Fixes #[issue number here]

Backwards compatibility

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[github-actions]

Coverage from tests in ./e2e_test/... for ./consensus/istanbul/... at commit ff0fa1a

coverage: 50.0% of statements across all listed packages

coverage:  60.4% of statements in consensus/istanbul
coverage:  42.7% of statements in consensus/istanbul/announce
coverage:  55.7% of statements in consensus/istanbul/backend
coverage:   0.0% of statements in consensus/istanbul/backend/backendtest
coverage:  24.3% of statements in consensus/istanbul/backend/internal/replica
coverage:  63.4% of statements in consensus/istanbul/core
coverage:  50.0% of statements in consensus/istanbul/db
coverage:   0.0% of statements in consensus/istanbul/proxy
coverage:  64.4% of statements in consensus/istanbul/uptime
coverage:  51.8% of statements in consensus/istanbul/validator
coverage:  79.2% of statements in consensus/istanbul/validator/random

[github-actions]

Test failures:
TestUpdatedKeyfileContents: keystore account_cache_test.go:393: Emptying account file failed account_cache_test.go:394: wasn't notified of new accounts
TestEthersJSCompatibility: e2e_test Checking getExchangeSpenders. spenders = [0x000000000000000000000000000000000000d028] Checking medianRate. numerator = 1000000000000000000000000 denominator = 1000000000000000000000000 Checking gas price minimum. cusdValue = 100000000 executing mocha test with /usr/bin/npm run test --networkaddr=http://127.0.0.1:44573 --blocknum=0x0 -- --grep ethers.js compatibility tests with state ethersjs-api-check@1.0.0 test /runner/_work/celo-blockchain/celo-blockchain/e2e_test/ethersjs-api-check mocha -r ts-node/register test/*.ts "--grep" "ethers.js compatibility tests with state" ethers.js compatibility tests with state ✔ provider.getBlock works (block has gasLimit set) (50ms) ✔ EIP-1559 transactions supported (can get feeData) ✔ block has gasLimit ✔ block has baseFeePerGas 4 passing (105ms) e2e_test.go:571: </code></pre></td></tr>
This test report was produced by the test-summary action.  Made with ❤️ in Cambridge.

[codecov]

Codecov Report

Patch coverage: 65.06% and project coverage change: +1.03 🎉

Comparison is base (71bdbcf) 54.30% compared to head (3fca039) 55.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2133      +/-   ##
==========================================
+ Coverage   54.30%   55.33%   +1.03%     
==========================================
  Files         692      675      -17     
  Lines      115642   113665    -1977     
==========================================
+ Hits        62795    62902     +107     
+ Misses      49014    46931    -2083     
+ Partials     3833     3832       -1     

Impacted Files	Coverage Δ
cmd/devp2p/internal/ethtest/transaction.go	0.00% <0.00%> (ø)
cmd/geth/chaincmd.go	0.00% <0.00%> (ø)
cmd/geth/main.go	21.39% <ø> (+0.91%)	⬆️
cmd/geth/usage.go	10.90% <ø> (ø)
cmd/utils/flags.go	2.56% <0.00%> (ø)
consensus/istanbul/utils.go	47.10% <ø> (+1.13%)	⬆️
contracts/currency/currency.go	55.00% <ø> (ø)
contracts/election/election.go	25.00% <ø> (ø)
contracts/epoch_rewards/epoch_rewards.go	88.88% <ø> (ø)
contracts/freezer/freezer.go	70.00% <ø> (ø)
... and 51 more

... and 26 files with indirect coverage changes

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