Update arrow-odbc requirement from 20 to 21

[dependabot]

Updates the requirements on arrow-odbc to permit the latest version.

Release notes

Sourced from arrow-odbc's releases.

v21.0.0

Added

• [breaking] Fetch Db2 Blobs as binary data and not text

Other

• introduce blob_on_db2 for local development

Changelog

Sourced from arrow-odbc's changelog.

21.0.0 - 2025-10-26

Added

• [breaking] Fetch Db2 Blobs as binary data and not text

Other

• introduce blob_on_db2 for local development

20.1.1 - 2025-10-25

Other

• Support arrow 57

20.1.0 - 2025-09-21

Added

• Then auto generating the insert statement into a table, column names which are already quoted, i.e. are enclosed in either rectangular brackets ([, ]), double quotes (") or backticks (`````) will not be quoted. This way if a column is named after a reserved keyword e.g. values or `from`, users could rename the column in the source to their quoted representation in order to avoid syntax errors in the statement.

Other

• Explain reasoning behind is_already_quoted in comment.
• Mention GitHub issue triggering the change to column name
• Test for insterting into a table with a column using a reserved
• Replace lazy_static with std::once_lock

20.0.1 - 2025-09-08

Other

• Support odbc-api 20

20.0.0 - 2025-08-21

Added

• [breaking] Support OdbcWriter taking ownership of Arc<Mutex>

19.1.1 - 2025-08-21

Other

• (deps) update odbc-api requirement from >= 15, < 17 to >= 15, < 18

19.1.0 - 2025-08-17

... (truncated)

Commits

• 25c25c1 chore: release v21.0.0
• a645885 feat!: Fetch Db2 Blobs as binary data and not text
• 73627f7 test: introduce blob_on_db2 for local development
• a3729cd chore: release v20.1.1
• 44a3a27 chore: Support arrow 57
• e3d9048 chore: Update CHANGELOG for quoting behavior in insert statements
• 6ac21d7 chore: release v20.1.0
• 7647bbd style: Explain reasoning behind is_already_quoted in comment.
• 5bb4603 style: Mention GitHub issue triggering the change to column name
• 3ac9f0b feat: Do not apply quoting to column names which are already quoted
• Additional commits viewable in compare view

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