deps: update dependency opentofu/opentofu to v1.8.7

[renovate]

This PR contains the following updates:

Package	Update	Change
opentofu/opentofu	patch	v1.8.6 -> v1.8.7

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Release Notes

opentofu/opentofu (opentofu/opentofu)

v1.8.7

Compare Source

BUG FIXES:

• Error messages related to validation of sensitive input variables will no longer disclose the sensitive value in the UI. (#​2219)
• Changes to encryption configuration now auto-apply the migration (#​2232)
• Updated github.com/golang-jwt/jwt/v4 from 4.4.2 to 4.5.1 to make security scanners happy (no vulnerability, see #​2179)
• tofu test is now setting nulls for dynamic type when generating mock values. (#​2245)
• Variables declared in test files are now taking into account type default values. (#​2244)

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